
Phenakistiscope (19th Century) from the Joseph Plateau Collection
"In the medieval Christian tradition, the devil is a mimic, an actor,  a performance artist, and he imitates the wonders of nature and  the divine work of creation. Unlike God, he can only conjure  visions as illusions, as he did when, in the person of  Mephistopheles, he summoned the pageant of the deadly sins  for Doctor Faustus and then seduced him with the appearance of  Helen of Troy.
                   
The Devil summons images in the mind's eye, playing on desires  and weaknesses; the word "illusion" comes from ludere, "to play"  in Latin. Conjurers mimic his tricks: an early Christian Father,  denouncing magicians, gives a vivid account of the lamps and  mirrors or basins of water they used, how they even conjured the  stars by sticking fish scales or the skins of sea horses to the  ceiling.
                   
 From the first showings of magic lantern slides, optical illusions  were ascribed to the Devil's mischief. In the mid-17th century,  when the Jesuit polymath Athanasius Kircher began  experimenting with shadows, lenses and reflections, he made  images of devils with pitchforks, Mister Death brandishing his  scythe, a soul burning in purgatory and other supernatural  scenes, as if the new technology inevitably involved phantasms  and spectres.
                   
 Optical illusions are not supernatural, however, as Kircher was  intent on demonstrating through his experiments. But illusions  also kept disrupting the boundaries between reality and fantasy.  Demonstrating tricks of perception, especially through the use of  mirrors (the art of catoptrics), Kircher showed how he could  manipulate the natural properties of light and play on the limits of  human faculties to create seductive and wonderful delusions.
                   
Running through the history of magic and the anxiety that it  stirred runs a parallel history of optics: if the Devil was able to  conjure appearances whereas God truly performed prodigies, it  was imperative to establish the truth status of the vision.
                   
  The collection that Werner Nekes has made over the past 30  years, displayed in the coming Hayward Gallery exhibition Eyes,  Lies and Illusion, gives a fascinating insight into the enchanted  enigma of appearances, and into the history of optical  investigation into these mysteries. It's a rich repository of human  thought about vision and all that it implies, and it includes the  whole range of optical devices, playing with every kind of effect,  from supernatural apparitions to visual puns and cracker fillers,  from the highest accomplishments of human intelligence to the  most light-hearted eye-twisters or visual jokes. His assorted  wonders of instruments, images, machines, toys, illusions and  effects span more than four centuries of human ingenuity and  invention at its most lively, ranging from an exquisite prism said  to have belonged to the philosopher Blaise Pascal to an 1898  automated flip book-cum-peepshow of a female dancer dimpling  and flirting.
                   
 "The soul never thinks without a mental image," declared  Aristotle. Trying to enhance human physical capacities with  lenses and apparatus of various kinds has been a strong motive  behind optical inventions. But the desire to reproduce mental  imagining has been an equally powerful engine behind inquiries  into the working of eye and brain. Robert Fludd, an Oxford  philosopher and esoteric neoplatonist of the generation before  Kircher, imagined the "eye of the imagination" as a prototype film  projector, beaming images on to a screen floating in virtual  space, somewhere at the back of the eyes. Descartes declared,  "First, it is the soul that sees, not the eye...", and this primacy of  the imagination offered some explanation for dreams and visions  and apparitions.
                   
 In the field of optics, many instruments were created to analyse  and reproduce vision, such as the camera lucida, the lens of which projects a reflected image onto the artist's paper or  canvas. But optics also reflects ideas about consciousness at  any given period; it expresses the potential of the inward eye for  every generation, the concepts of cognition and mental  projection, and the tendency of the mind to assemble random  marks into intelligible data.
                   
 In 1784, the landscape painter Alexander Cozens advised fellow  artists to follow the promptings of fantasy and create images from  blots of ink on crumpled paper: this astonishingly modern idea  about chance and composition echoed Leonardo da Vinci's  practice, nearly three centuries earlier. Leonardo was in fact  quoting his fellow artist, Botticelli: "By merely throwing a sponge  full of diverse colours at a wall, it left a stain on that wall, where a  fine landscape was seen." But Cozens arrived at his "New  Method" on his own, without prior knowledge of his Renaissance  precursors, and made startlingly expressionist images. Werner  Nekes has a rare album of 1885 filled with drawings of imps and  devils that were doodled by workmen following the drips and  splashes of coffee on the walls they were plastering.
                    
 Anxiety about the unreliability of vision continued long after most  believers in the Devil's antics had faded away, and after the 17th  century it spurred closer analysis of the human faculties,  especially sight. These discoveries led to the society of  surveillance on the one hand, and of mass media on the other.  But it is also the case that new technologies created a mass of  popular illusions that no longer alarmed their consumers, but  amused them hugely. These were diversions and spectacles,  and they were pure pleasure.
                   
 In 1827, John Ayrton Paris created the thaumatrope (from Greek  "wonder" combined with "motion"), a round disc threaded on a  string with one picture on one side and another on the reverse;  when the disc was spun, the images merged. The thaumatrope  was crucial to the development of moving pictures, which would  eventually give the impression of life itself flowing past when  projected on to a screen at the rate of 24 frames a second.  Phantasmagoria shows began touring Europe at the end of the  18th century. In the wake of the Terror in France, the brilliant  impresario, balloonist and cinematic pioneer Etienne-Gaspard  Robertson inaugurated the thrills of the horror movies when he  projected spectres on to smoke - including the severed head of  Danton, then a recent victim of the guillotine.
                   
 The Victorian audience was travelling vicariously in the footsteps  of explorers who continued to open up continents: the natural  magic of the lantern slide beamed natural wonders from all round  the world. Many different kinds of shows revealed worlds near  and far through spectacular illusions. In 1821, in order to make a  panoramic painting of London, the Hull-born artist Thomas  Hornor climbed to the top of the cross on the dome of St Paul's  Cathedral, and built a crow's nest. From here, where Hornor  bivouacked for the time it took, he made a 360-degree picture of  London. He used a telescope to examine details, and calculated  the perspective to position the viewer convincingly in the scene.
                   
 In Edinburgh in 1835, Maria Theresa Short, daughter of an  optical instrument maker, created one of the very first popular  public camera obscuras. It is still there, on Castle Hill, and it  captures through a periscope and angled lenses the thronged  scenes of the streets below, projected by light rays alone onto a  white convex dish. The projection is still an astonishing effect,  and it brings into being, with no more magic than a series of  angled lenses, ancient dreams of summoning absent sights  through gazing into a bowl of water or an oracular mirror.
                   
 Optical media of communication available today have opened  paths to new forms of beauty in reflection and projection,  distortion and illusion. When Tony Oursler, on display in the  exhibition, projects lopsided spectral faces uttering messages  from the ether, or angels ascend through streaming water in Bill  Viola's films, or Gary Hill materialises eerie apparitions that loom  and then fade, they are claiming this territory for art in our era,  and pressing optics into the service of a new metaphysics.
                   
The taming of illusion through deeper understanding and ever  more ingenious techniques of simulation has only been partial.  There has remained something stubbornly weird about the  images optical devices can create, especially with the advent of  cinema when they became so clever at producing the  appearance of the real.
                   
  Werner Nekes's collection plays a range of effects as if on a  giant organ of visual phenomena, from profound investment in  the objective truth of vision to an equally strong engagement with  radical subjectivity. However, as we move nearer our era, his  artefacts and devices reveal how the media of visual trickery,  deception and illusion move away from scientific scrutiny towards  distraction, leisure and entertainment. At the same time, the  perfection of visual technologies has destabilised experience  until we cannot be sure if we are not the dreamers but the  dreamed, as in a recursive fable by Jorge Luis Borges. On  television in the US, footage sometimes carries the heading  "Metaphorical Images" to warn that the film does not  communicate what is actually occurring. As The Matrix films  dramatise, illusion has turned us into wanderers in "the desert of  the real".
                   
The world accessible to the senses began to fall away a very  long time ago, perhaps in Plato's cave; it began turning into an  insubstantial pageant of optical illusion, placing the observer in  the dislocating yet oddly pleasurable situation of not knowing  where reality begins and ends."
Marina Warner, 
The Guardian, Saturday September 25, 2004
Note: Eyes, Lies & Illusions, drawn from the Werner Nekes collection - and based on an exhibition originally devised by the Hayward Gallery, South Bank Centre, London - is now on show at at ACMI (Australian Centre for the Moving Image) until 11 February 2007.