At first glance, there may appear to be more to separate Michelangelo (1475-1564) and Bill Viola (b. 1951) than to unite them: one, the great master of the Italian Renaissance; the other, the creator of state-of-the-art immersive sound and video installations. And yet, when Martin Clayton showed Viola Her Majesty The Queen's unsurpassed collection of Michelangelo drawings at Windsor in 2006, parallels began to emerge.