Illusions

The "face on the moon" is very prominent in this shot from the LRO spacecraft

Why does the face of the "man in the moon" always accompany us?

The Ames room - Adelbert Ames Jr. was invented in 1946 according to an idea conceived by Helmholtz. The three people are equal in size. The shape of the room is distorted. The source Wittereich, WJ (1959). Visual perception and personality, Scientific American, 200(4) ), 56-60. Photograph courtesy of William Vandivert.

Our twisted mind

playing cards. From Wikipedia

The place where memories go to die

Very important: the current record includes a thought experiment at the very beginning. If you are reading the entry in google reader or on the main page of the blog, do not continue reading without entering the full entry and following