This page contains pictures that can be viewed in 3 dimensions. The top pair has the left picture on the left and the right picture on the right, which can be view in parallel. You likely will need a 3D viewing aid. The bottom pair has the left picture on the right and the right picture on the left, which can be view cross-eyed. Cross your eyes so the the right eye sees the left picture and the left eye sees the right picture. Many people find they can do this after a little practice.
