This hand-held optical illusion is absolutely hypnotizing. Gently pull the wire through your fingertips and the spirals appear to unwind—an impossible animation effect sure to mesmerize anyone you share it with. Sliding the wire through your fingers takes a minute to master but the technique is fairly intuitive and once you get the knack, the illusion of infinite spiraling is good enough to fool yourself. Finally, hallucinogenic fun for the whole family!