Sensational Blocks
You present a column of cubes which are marked with the numbers 1 to 4. The number 4 is at the bottom, followed by the number 3, the number 2, and the number 1 on top. You cover the stack of cubes with the tube, lift off the tube and show, that the cubes are arranged with the number 1 at the bottom, the number 4 on top.
