Is it going up? Is it going down? You can never be sure with this twisted illusion. Based on science, but bound to amaze.The ball is secure in it's spiral of copper. Spinning it one way the ball seems to float to the top, spin it the other, will it fall out the bottom? The ball contains phosphorescent chips that will absorb energy in the sunlight and then radiate a green glow in the dark. Comes with a ball bearing swivel and a strong "s" hook, this spiral will stand by itself or can be attached to any other spinner for a really interesting look.