Euler's Disc: Spinning disc goes for minutes!

Falling has never looked as cool as when showcased by Euler's Disc. Named after the famous mathematician Leonard Euler (pronounced Oiler), this desk toy is a stunning demonstration of several physics concepts. With a twist of your fingers, the heavy chrome-plated disc can fall for up to two minutes! This motion is known as sprolling (a combination of spinning and rolling), and it causes the disc to make circular passes around the center of the base while remaining upright like a spinning top. As the disc loses energy, the angle between it and the base diminishes and an interesting whirring sound develops. Place a combination of the included magnetized holographic foils on the top of the disc to create interesting visual effects. For a light show that is nearly beyond belief, turn out the lights and add a laser pointer! Don't be shy; smart stuff is fun!

Euler's disk explained. Using physics to fall down VERY slowly.

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Toysmith Euler's Disk – Create A Hypnotic Display of Light & Sound with Our Office Desk Accessories – Science Toys for Adults & Kids 8+ : Toys & Games