Yeah, this urban legend always gets trotted out to criticize neural networks, but after years of looking, I've never been able to confirm it, and even when Minsky tells it, he can't name any names or concrete details about when or where - for example, in Minsky's version, it was how the photographs were developed, but in yours, it's winter/summer, and in other versions, it's night vs day, or it was forest vs grass: http://lesswrong.com/lw/td/magical_categories/4v4a http://lesswrong.com/lw/lvh/examples_of_ais_behaving_badly/c...