This is another BLIT story by David Langford; this time, a brilliant mathematician working on a neuro-mathematical model of the brain finds a type of visual input that doesn't just slow it down but causes a cascade failure, leading to death. In essence, "a key to unthinkable images. Computer op-art that takes advantage of the flaws which mathematics says the mind must have. A pattern which compels attention, perhaps a pattern from which you couldn't easily look away. Runes of power." A co-worker, who is homosexually attracted to the mathematician (with explicit reminder of Turing's supposed sexual orientation) ends up killing him with such a pattern. Standard references to Godel and Turing are thrown in without many details. I found it to be a very half-hearted attempt at a repeat of "BLIT".