If we stare at a pattern for a sufficient amount of time, our brains will cause the pattern to spontaneously reorganize itself.
Many psychologists believed that humans' pattern recognition abilities exist to aid us in our survival. This ability make us able to quickly identify possible danger/occurrences from several sign, which will help us to produce faster fight or flight response.
The attacker claimed he and Newman completed "Who is afraid of Red, Yellow, and Blue" together and hated how the restoration was done. However, it wasn't up when he went, so he took out a knife and destroyed Cathedra. I do not remember his name. I believe it was in 1997?