HESers, I came across this optical illusion on a blog yesterday (hat tip to Radley Balko). The blogger just thought it was a cool illusion, which it is, but as I watched it and listened to the explanation from the narrator, it became clear that it is actually evidence for the main argument of The Sensory Order, namely that the mind "pre-classifies" sensory data based on experiential learning. That is, the mind makes sense of the world based on past experience, even when, in the case of this illusion, we can know that the actual sensory data of the world are different from what the mind makes us see. The narrator's reference to "top down knowledge" makes it clear that it is an analog to Hayek's use of "model" in TSO. Enjoy. http://tinyurl.com/2cfgev Steven Horwitz