Rokeby Venus as well as classical sculptures known to Velázquez, of which casts were made for Madrid. These were the "Sleeping Ariadne" now in the Pitti Palace, but then in Rome, of which Velázquez ordered a cast for the Royal collection in 1650–51, and the Borghese Hermaphroditus, a sleeping hermaphrodite (picture to the right above), now in the Louvre, of which a cast was sent to Madrid, and which also emphasises the curve from hip to waist. However, the combination of elements in Velázquez's composition was original. The "Rokeby Venus" may have been intended as a pendant to a sixteenth-century Venetian painting
David Rokeby some off-the-shelf, some rare and esoteric, and some cooked up by Rokeby himself. Initially, in 1982, much more of the system was homemade. His circuitry, designed to speed up the response of the sluggish Apple II, was still not fast enough to analyze an image from an ordinary video camera, so he built his own low-res device: a little box with 64 light sensors behind a plastic Fresnel lens. But Very Nervous System has been evolving for 13 years, during which time the world has seen any number of technological revolutions. So Rokeby now has a lot more store-bought components