Rattlebacks were discovered by archeologists and were originally called celt stones. Rattlebacks are designed to only spin in one direction. If you try to spin it in the opposite direction a rattleback will slow down, stop and reverse direction. How can it do that? Explanations are included. The translucent rattleback also magnifies if it is laid down on the flat side. Each rattleback is blister packed and comes in assorted colors. Fascinating! |