1. Space is an abstraction
        At first glance, space is transparent, invisible: we 
          see the things, the persons and the objects, but not space itself. 
          Perceiving space involves a whole process of abstraction. It is in space 
          that geometry originates, based on an abstract vision of nature and 
          the forms found in nature. On this point, as on so many others in our 
          cultural tradition, the conception of space is a product of the Greek 
          mind.
        It is a well-known fact that the Greeks knowledge 
          of astronomy was no more advanced than that of neighbouring civilisations, 
          particularly the Babylonians. And yet, by developing a rational focus, 
          by going beyond mythological or astrological thought, the Greeks founded 
          cosmology and astronomy, the disciplines concerned with the scientific 
          study of the universe.
        This rational conception of knowledge, which has its 
          basis in what the Greeks called logos, thought-language, involves 
          the replacement of a symbolic system of representation by a numerical, 
          mathematical, geometrical system. For example, whereas in the Ancient 
          Greek cosmogonies, the Earth was conceived as being set on roots that 
          descended down into infinity, or placed inside a large receptacle, for 
          Anaximander (c. 618-c. 548 B.C.), the philosopher from Miletus, the 
          Earth was a truncated column situated in the middle of the cosmos. Comparing 
          these two representations, the Hellenist Jean-Pierre Vernant (1973, 
          p 187) writes: We see the birth of a new space, which is no longer 
          the mythical space with its roots or its receptacle but a geometrical 
          type of space. It is of course a space essentially defined by distance 
          and position, a space that allows the stability of the Earth to be founded 
          on the geometrical definition of the centre in relation to the circumference.
        It was in fact the Ancient Greeks who, going beyond 
          the mythical notions of place (topos) and of home  the 
          human home (first a palace, then a heros mansion and finally a 
          family residence) and the home of the gods (the temple)  established 
          the idea of space, which was to become one of the most important and 
          significant categories in Western thought.
        The idea of space requires the configurating, operational 
          activity of a rational, mathematical mind. Only on this basis do the 
          literary, artistic or musical  i.e. aesthetic  uses of it 
          become possible afterwards, in a cultural afterwards conceived 
          as anthropological tradition.
        The concept appears in the process of creation of science-philosophy 
          in Greece, and probably for the first time with Pythagoras (570-497 
          b.c.), which in itself is relevant, given the central role of numbers 
          and of mathematics in his thinking. It later occupied the attention 
          of Zeno of Elea (490 B.C.), in his well-known logical paradoxes on movement. 
          And it received a precise formulation as a category in one of the last, 
          and in time most influential, of Platos dialogues  Timaeus, 
          probably written in the second half of the fourth century B.C.
        How did the creation of the world occur? It is in this 
          cosmological context that Plato establishes a precise categorial use 
          of the term space (jora) when he states that being and 
          space and generation, these three, existed in their three ways before 
          the world was born (Timaeus, 52d). In Plato, the being 
          corresponds to the exemplary Forms or Ideas, 
          which he characterises as the same, uncreated, indestructible 
          being, and also as invisible and imperceptible by any sense. 
          On the other hand, creation is perceived by sense, created, always 
          in motion (Timaeus, 52a).
        Between these two opposite poles  Ideas-Forms, 
          which are beyond the world, and creation, which relates 
          to the world of the senses  there is also, according to Plato, 
          a third nature, which is space, and is eternal, and does not admit 
          of destruction and provides a home for all created things, and is apprehended 
          without the help of sense, by a kind of spurious reason; which we beholding 
          as in a dream, say of all existence that it must of necessity be in 
          some place and occupy a space, but that what is neither in heaven nor 
          on earth has no existence. (Timaeus, 52b).
        The Platonic conception of space not only makes it 
          a kind of intermediary between the essential fixedness of 
          being and the changing creation of what is perceptible to the senses, 
          but in addition its eternal, indestructible nature provides a home to 
          everything that has an origin; in other words, it acts as a receptacle 
          or container, in which all things and beings are situated and have their 
          place. It can only be apprehended by a kind of spurious reason, 
          and in this it is distinguished from the Forms that can only be reached 
          through true reason, through the strict use of reason; but 
          without the help of sense, which also implies that it is 
          different from creation, apprehended by the senses and not by reason. 
          Thus in the final instance, in a situation midway between reason and 
          the senses, while at the same time outside both planes, space is such 
          an abstract idea that, as Plato himself admits, it is difficult to credit.
        Certainly, this abstract idea of space can only be 
          sustained in the framework of a cosmological reflection, and can only 
          be apprehended by a type of reasoning that is eminently numerical and 
          formal  the reasoning of mathematics, of geometry. But precisely 
          because it lacks figure, lacks form, space acts categorially 
          as the conceptual framework of possibility in order to distinguish and 
          demarcate every form or figure; and also as the territory that enables 
          us to make distinctions between what is empty and what is filled, which 
          were central aspects of Greek cosmological thinking prior to Plato, 
          particularly in Parmenides and Democritus.
        It is obvious, moreover, that this abstract category 
          is formulated on the basis of the experience and the impulse provided 
          by forms of construction, by architecture. In all human societies, from 
          the most ancient and remote times, the solution to the problem of shelter 
          or habitat has been a fundamental question. The notion of home 
          that covers both domestic use and the different ritual uses (in religion, 
          power, etc.) involves changing from a more or less prepared natural 
          space to an artificial space constructed according to the 
          material determinations of the ecosystem and the use to which it is 
          put.
        However, what is interesting in the Greek case is that 
          the different forms of construction (house, temple and city) form a 
          unit together, a visual unit, that derives precisely from 
          the existence of an organic system of structuring space: The only 
          common factor whose essence is not susceptible to material alteration 
          or practical change is the system of structuring space that lies behind 
          all the manifestations of architecture in Greece (Martienssen, 
          1956, p 145). The construction variables derive from the requirements 
          of the specific purpose, whereas the elements of the measurement 
          and organisation of space appear as constants, which shows the 
          subtle gradation of the abstract as a constituent element of Greek architecture 
          (Martienssen, 1956, p 146).
        Measurement and organisation, or measure and 
          order, are precisely two of the aesthetic categories that are central 
          not only to Greek culture but also to the Roman and Hellenistic world. 
          But they in themselves appear in the constructive process as procedures 
          for defining an abstract premise that acts as a substrate or foundation. 
          In other words, measure and order are ways of making space visible, 
          of demarcating it in a specific human use.
        2. Visual space
        The Greek conception of space as an abstract entity 
          not only permits a mathematical, geometrical foundation for the theories 
          of the universe but also confers a unity on the visual forms of representation. 
          It is not only architecture, but statuary and painting too are involved 
          in placing it on an abstract plane of experience that makes its autonomy 
          and development possible.
        But there is a great difference between the geometric 
          and cosmological version of space and its visual version. Visual space 
          is conceived as an image of cosmic and geometrical space, which 
          it presupposes, though situated in a different order of thought and 
          existence. The visual (and literary and musical) version of space in 
          the Ancient Greek world was established within the framework of perceptible 
          representation, as one more aspect of mimesis, that skill or 
          talent for producing images that, with time, has become central 
          to our idea of art.
        The artist (sculptor, painter and to some extent architect) 
          makes a cut, a caesura, in the abstract substrate that we conceive 
          as a receptacle for all forms and things, thus making it visible: 
          by giving it a perceptible support, by demarcating its form, the work 
          of art becomes a kind of echo, a materialisation, of that abstract idea 
          that enables us to think scientifically of the development of the cosmos.
        The classical order of representation, which in Greece 
          and the ancient world in general already had as one of its principal 
          objectives the achievement of figurative illusion, was finally 
          to be structured in the Quattrocento  thanks to the perfecting 
          of geometrical perspective  as an artistic universe whose 
          figures looked more lifelike on account of the illusion of spatial 
          framing that was then perfectly possible. Nearness and distance 
          became elements in a process that gave priority to the fixed, stable 
          nature of the visual space, which in turn determined the strict position 
          of the viewpoint, the observer.
        Although geometrical perspective is a visual and symbolic 
          convention (cf. Erwin Panofskys classical study, 1927), it was 
          eventually to become the sole and exclusive criterion for the representation 
          of space in the Western artistic tradition until the eclipse of Classicism 
          in the last quarter of the nineteenth century and the early twentieth 
          century.
        It is perhaps not too hazardous to establish a relationship 
          between this tendency to fix as an absolute in art what must have always 
          been considered as one option among many others, and the similarly exclusive 
          nature of Euclidean geometry, which served as the scientific basis for 
          it. The question is of even more concern when, in the process of development 
          of modern science, Isaac Newton (1687, p 33) formulated what is known 
          as his theory of absolute space: Absolute space, in 
          its own nature, without relation to anything external, remains always 
          similar and immovable.
        This idea of space is, as already mentioned, the counterpart 
          in physics to Euclidean space in mathematics. Cosmic space becomes a 
          kind of large stage: according to Gray (1992, p 244), it 
          can be conceived as an immense stage on which occur the events that 
          constitute the universe: eternal stars, small particles, ourselves. 
          In fact, we are not far from the Platonic concept of space as an eternal 
          receptacle, but of course with Newton we have a mathematical and cosmological 
          foundation for his theories that had not yet been possible in the Greek 
          world.
        These questions serve to reveal an interesting parallel 
          in the field of art. If in Newtons physics space and time are 
          conceived as absolute magnitudes, in one of the high spots 
          of the theory of the arts of the Classical period, in Laocoon 
          (Lessing, 1766), the notions of space and time are the reference points 
          that enable a semiotic difference to be established also in absolute 
          terms between the visual arts on the one hand and literature and music 
          on the other. 
        It is well known that at the core of Lessings 
          book is the need to establish a rigorous critique of the humanist formulations 
          of the identical nature of the arts. To fix with precision the limits 
          of the different artistic languages or genres is certainly 
          fundamental to the stability of the Classical aesthetic order. In this 
          context and based on Aristotle, Lessing magisterially formulates a semiotic 
          rather than a normative theory of the difference between the visual 
          arts (painting, he says metonymically) and literature (poetry 
          in its equally metonymic formulation).
        Painting and poetry, according to Lessing (1766, p 
          106), use entirely different media or signs in order to imitate reality. 
          Whereas painting uses figures and colours arranged in space, 
          poetry uses articulated sounds that succeed each other over a 
          space of time. Hence, too, he says, the representation of the 
          bodies is the object of painting, whereas, since the successive 
          objects or their successive parts are generally called actions, 
          it is these that constitute the object of poetry.
        Lessing (1766, pp 106-107) nevertheless concedes a 
          degree of crossing-over between the objects of poetry and 
          of painting. This is because, as the actions have no independent existence 
          but are performed by specific beings, and to the extent that these beings 
          are bodies, poetry also represents bodies, but only in an allusive 
          way, through actions. This merely allusive representation of the 
          body involves a choice, since, as a temporal art, poetry can only 
          use a single quality of bodies; hence the fact that it has to choose 
          the one that brings to the mind a more visual image of the body from 
          the viewpoint that this art requires for its own purposes.
        In the same way that bodies exist not only in space 
          but also in time, painting for its part can also imitate actions, 
          although again only in an allusive way, through bodies. 
          In the same way as what happened with poetry, the characteristics of 
          the signs it employs mean that painting, when representing actions, 
          can only use a single moment of the action; so it has to 
          select the most pregnant of all these moments, the one most able to 
          take over the preceding moment and the following moment.
        Although in Laocoon itself there are certain 
          lines of perspective that afford a glimpse of the then imminent crisis 
          in Classicism and the beginning of the Romantic revolution, particularly 
          through the central role that Lessing (1766, p. 53) attributes to the 
          imagination in the perception of beauty, nonetheless the structural 
          frontier between spatial arts and temporal arts 
          is too rigid. He also ignores the fact that the mixture of supports 
          and forms of expression in a single aesthetic proposal have been a constant 
          factor throughout the history of perceptible representation in our cultural 
          tradition, as occurs, for example, in the case of drama, or in the inclusion 
          of song, music and gesture in the most ancient forms of Greek poetry.
        3. Space is indissociable from time
        Already in our era, with the development of modern 
          technology, and in the specific field of the arts, with the invention 
          of motion pictures, which epitomised the combining of the dimensions 
          of space and time in a single expressive universe, the aesthetic, semiotic 
          separation between the representation of space and of time increasingly 
          came to be seen as somewhat inadequate. In this new cultural climate, 
          the artistic avant-gardes also rejected the Classical idea of the frontiers 
          between the different artistic genres or languages, precisely seeking 
          in the violation of these boundaries a new aesthetic ideal  that 
          of the convergence of all types of processes and materials in the unity 
          of the work of art. This was an idea already anticipated by Richard 
          Wagner, in his theory of the musical drama and his formulation 
          of the category of the total work of art (Gesamtkunstwerk), 
          as the maximum expression of the desire to transgress the classical 
          limits and merge all kinds of materials and processes in the unity of 
          the work.
        Paul Klee (1920, p 4), for example, who in his youth 
          had been an enthusiastic reader of Laocoon, expresses quite clearly 
          Lessings rejection of any distinction: In Lessings 
          Laocoon, much noise is made about the difference between temporal 
          art and spatial art. And this, contemplated with greater precision, 
          is no more than erudite delirium. Because space too is a temporal concept. 
          Klee considers movement as the basis of all creation, and this means 
          seeing the temporal dimension in the creation of space. Obviously, Klee 
          is referring to visual space rather than to that abstract space, 
          conceived as a receptacle of creation, that Plato had characterised 
          as eternal.
        It should be noted also that, since Antiquity and even 
          in the ordinary sense, space and time had been considered as related 
          entities. The Latin expression spatium temporis (space of time) 
          is a good example of this. Succession can also be perceived as extension. 
          Only the abstract, cosmological formulations of Newtonian physics, with 
          its ideas of absolute time and space, considered as independent 
          magnitudes, could conceptually justify such an absolute separation between 
          the two categories.
        But the development in the nineteenth century of non-Euclidean 
          geometries and the appearance later on of new theories of physics, such 
          as undulatory mechanics or the theory of relativity  significantly 
          in the same period as the emergence of the artistic avant-gardes  
          was to lead to a profound questioning of the absolute conceptions of 
          space and time, and to different cosmological formulations all based 
          on the idea of the space-time continuum.
        The resistance to the abandonment of the postulations 
          of Newtonian physics in the scientific community itself is well documented. 
          As Gray (1992) explains, what shocked most people was the complete abandonment 
          of absolute space. The existence of an external world independent from 
          the observer had been associated with the belief in the absolute properties 
          of objects in space. The objects move, therefore the objects are there, 
          whether we like it or not. Despite this, and in principle for philosophical 
          and aesthetic reasons (their elegance and beauty, a decisive 
          aspect in the acceptance of scientific theories), the formulations of 
          the new physics were forging a path: Einstein showed, however, that 
          the description we offer depends on what we are doing and where we are 
          in a way that is more subtle than any other we would have expected, 
          and more subtle that what many people were prepared to accept (Gray, 
          1992, p 254).
        The questions raised by the great mathematician Hermann 
          Minkowski, at a lecture given in 1905, clearly and precisely establish 
          the new use of the categories of space and time in contemporary physics: 
          Space and time must be lost in the shadows and only a world in 
          itself will exist. And again: Nobody has yet observed any 
          place other than in a time, nor has anybody observed any time other 
          than in a place (quoted in Gray, 1992, p 255). Although it should 
          be taken into account that the notion of time-space prevalent in physics, 
          and especially in the generalised theory of relativity, formulated by 
          Einstein in 1916, must not be confused with an intuitive image of a 
          reality or parameter in which time is blended 
          with space, there is no doubt that the abolition of the conception of 
          absolute space and time in the framework of contemporary scientific 
          knowledge was to have a notable repercussion in the field of artistic 
          practice and theory as well as in matters of common sense, gradually 
          accustomed to confronting more or less successful film or literary versions 
          of the paradoxes of Einsteins relativity, today so familiar to 
          us all.
        4. From the representation 
          of space to the construction of space
        The art of our time gradually took a revolutionary 
          turn that hinged on the idea of the transition from the visual representation 
          of space to the construction of space. It was a step that 
          was strongly influenced by the new sensibility that had made the development 
          of technology possible. New viewing mechanisms provided by high precision 
          machines, and in particular photography and films, liberated the visual 
          arts from the commitment to figuration and illusion that had marked 
          their fate since Classical Antiquity.
        The visual idea of space, the artists work of 
          perceptibly demarcating the image, was thus released from a conventional 
          representation and gave way to the fully autonomous possibility of spatial 
          structuring, or construction of the visual space, conceived as 
          an entirely independent, perceptible, intellectual entity.
        The emblem that marked this new horizon 
          in the arts was Picassos Les demoiselles dAvignon 
          (1907), with its deconstruction of classical representation and the 
          inclusion of different representational conventions in a single painting. 
          After this would come Cubism and the various Constructivist proposals, 
          whose developments were to cover the entire twentieth century down to 
          the present day.
        This, as I mentioned above, is the context of Paul 
          Klees ideas (1920, p 4) as expressed in his Creative confession 
          on the integration of space and time in the work of art: When 
          a point becomes movement and line, it requires time. The same happens 
          when a line moves to become a surface. In the same way the movement 
          of surfaces creates spaces.
        These ideas are clearly echoed in Point and line 
          to plane (1926), one of the most important theoretical texts written 
          by Wassily Kandinsky, who had joined Klee at the Bauhaus in 1922. What 
          is notable, in particular, is the counterpoint that Kandinsky (1926, 
          pp 109-110) establishes between artistic work and technical work, and 
          his call for a pure art: The Constructivist works 
          of recent years are in a large part, especially in their primitive form, 
          pure or abstract construction in space, without any practical 
          purpose, which distinguishes them from works of engineering and forces 
          us to place them in the category of pure art.
        Something had changed, radically and irreversibly, 
          in the world of art, and the newly emerging conception of visual space 
          played a fundamental role in that change. When Kandinsky spoke of pure 
          or abstract construction in space he was fixing with precision 
          the new horizon of the plastic arts, finally freed from the mere reproduction 
          of a fragment of space. The art of our time had entered 
          a territory that was entirely different from any previous references 
           that of the dynamic construction in time of a fully autonomous 
          space. Instead of reproduction, construction. This is what Paul 
          Klee (1920, p 2) had also expressed in different terms in the first 
          sentence of his Creative confession: Art does not 
          reproduce the invisible, but makes something visible.
        All the rest was to follow along at its own pace. With 
          Brancusi, sculpture was to begin a process of emancipation from the 
          pedestal and of formal, staged expansion that has continued down to 
          the present day. And at least after El Lissitzsky, with his constructions 
          that he called Proun (an acronym for Project in affirmation 
          of the new) in the early twenties, art appeared as the global 
          articulation of a set of diverse elements.
        The concept of installation derives from 
          all this, from that Constructivist core that finally freed the work 
          of art from any subjection to representation, steering it towards the 
          production of a space  a space that can contain the traditional 
          supports and media of the visual arts (drawing, painting, sculpture, 
          etc.), but also the new media  from photography and 
          film to video and digital supports  and, more importantly, the 
          supports and media that are non-visual (?) according to 
          the classical mentality: language, sound, gesture, setting, etc.
        Art opens up a process of generation of autonomous 
          universes, each with its own time and space, breaking away from the 
          everyday experience or the practical uses of technology. Worlds apart. 
          In them, we seem to hear an echo of what Hermann Minkowski, as I mentioned 
          above, formulated in the field of the theory of physics: Space 
          and Time must lose themselves in the shadows and only a world in itself 
          will exist.
         
        R e f e r e n c e s
        
          - Jeremy Gray (1992): [Ideas of Space] Ideas de espacio. 
            Spanish translation by F. Romero, revised by J. Ferreirós; 
            Mondadori, Madrid, 1992.
 
          - Vasily Kandinsky (1926): [Punkt und Linie zu Fläche] Punto 
            y línea sobre el plano. Contribución al análisis 
            de los elementos pictóricos. Spanish translation by R. 
            Echavarren; Barral, Barcelona, 1971.
 
          - Paul Klee (1920): [Schöpferische Konfession] Confesión 
            creadora. Spanish translation [there are many other versions] 
            from the catalogue Klee. Óleos, acuarelas y dibujos; 
            Fundación Juan March, Madrid, 1981, pp 2-7.
 
          - Gotthold Ephraim Lessing (1766): [Laokoon: oder über die 
            Grenzen der Malerei und Poesie] Laocoonte. Introduction and Spanish 
            translation by Eustaquio Barjau; Tecnos, Madrid, 1990.
 
          - R. D. Martienssen (1956): [The Idea of Space in Greek Architekture] 
            La idea del espacio en la arquitectura griega. Spanish translation 
            by E. Loedel; Nueva Visión, Buenos Aires, 1980.
 
          - Isaac Newton (1687): [Philosophiae Naturalis Principia Mathematica] 
            Principios matemáticos de la filosofía natural. 
            Spanish translation and notes by Antonio Escohotado; Tecnos, Madrid, 
            1987.
 
          - E. Panofsky (1927): [Die Perspektive als "symbolische Form"] 
            La perspectiva como forma simbólica. Spanish translation 
            by V. Careaga; Tusquets, Barcelona, 1973.
 
          - Jean-Pierre Vernant (1973): Mito y pensamiento en la Grecia antigua; 
            Ariel, Barcelona. Spanish translation by J. D. López Bonillo 
            from the corrected version of Mythe et pensée chez les Grecs; 
            F. Maspero, Paris, 1965.