These optical illusion spirals are great conversation pieces. Just twist the metal spiral and the ball appears to move up and down. It's a crystal ball, so use it indoors away from direct sunlight.

Large Spiral Illusion Item # SI 0711 L 27"L x 3 3/4"W $ 56.00

Small Spiral Illusion Item # SI 0711 S 20"L x 3 3/4"W $ 42.00