The Pirahãs are unable to perceive some things that even children from Western culture perceive well. For one thing, Pirahãs cannot make out two-dimensional objects, as in drawings and photographs, very well. They often hold pictures sideways or upside down, and ask me what it is that they are supposed to be seeing. They are getting better nowadays, as they have been exposed to many photos, but still this is not easy for them.
