From Sue Hubbard at 3quarksdaily….
In his Allegory of the Cave, Plato’s chained prisoners, trapped in their subterranean world, mistook shadows cast on the wall for reality. When they spoke of the objects seen what was it they were speaking of; the object itself or its shadow? Such conundrums lie not only at the heart of western philosophical debate about the nature of reality but, also, of photography. The essence of photography involves an apparent magical ability to fix shadows on light sensitive surfaces. As far back as the second half of the eighth century, the Arab alchemist Jabir ibn Hayyan (c.721-c.815) recorded that silver nitrate – the significant element of the light-sensitive emulsion of photographs – darkened in the light. In the eighteenth century Thomas Wedgwood experimented with painting on glass placed in contact with paper and leather made chemically sensitive to the effects of light. Sadly the results remain unknown as Wedgwood lacked the know-how to fix his images.
From 1834 William Henry Fox Talbot (1800-1877) created ‘sciagrphaphs’ (the depiction of shadows) and ‘photogenic drawings’ using botanical specimens and lace placed on sensitized paper. These spectral images implicitly posed questions about the nature of reality. The term for all such works is a ‘photogram’, though strictly speaking they do not depict shadows as they are caused by the blocking of light rather than by a cast shadow. The photogram was later usurped by the process of projecting negatives through an enlarger lens. In an increasingly mechanist age this new technology proved more seductive to the scientifically minded Victorians than camera-less photography, which became the idiosyncratic realm of those interested in exploring the subconscious and the so-called spirit world. The playwright August Strindberg took to leaving sheets of photographic paper in developer exposed to the night sky, believing that his resulting ‘celestographs’ were caused by this exposure to the heavens rather than to the more prosaic explanation of dust collecting on the surface of the paper. In 1895 the previously unwitnessed interior of the human body was revealed by Wilhelm Konrad von Röntgen’s newly discovered x-rays, mirroring a growing interest in the unconscious and the revelation of that which could not be seen by the naked eye. More…
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