Sometimes our eyes will cheat ourselves, if you do not believe it, let us do a simple experiment.Picture1:What can we see from this picture? Are the pillars （柱子） square or round?Picture 2:Are these pictures moving?Picture 3:There are three faces in the picture , can you find it?Picture 4:What can you see?Picture 5:Picture 6:Picture 7Picture 8:Its said the it has nine hearts.Picture 9:Impossible stairsTake a walk in the strange stair, what will happen? Where is the lowest and highest step?Picture
