摘要
Put a stamp on your table. Then put a glass of water on the stamp. Cover the glass with a saucer, as shown. The stamp disappears! Try to walk around the glass and look into it from different sides.
Put a stamp on your table. Then put a glass of water on the stamp. Cover the glass with a saucer, as shown. The stamp disappears! Try to walk arotmd the glass and look into it from different sides. You will not be able to see the stamp.
