Euler's Disk A hypnotic display of light and sound that spins science into art. The 3"" diameter chrome-plated steel disk will spin faster and louder the longer it rotates. Just give it a spin and gravity does the rest. Includes Disk, 9" concave mirror base and 9 pieces of holographic, magnetized foil. 6 disks included per pack. ? Age Grade: 8+ Batteries Not Required Spin science into art Disk will spin faster and louder the longer it goes Creates a hypnotic display of light and sound as it rotates Just give this fidget toy a spin and gravity does the rest Use this office toy to reduce anxiety and increase focus A giftable mind game to promote an interest in science Patented 3" diameter chrome-plated steel disk Includes Disk, 9" concave mirror base and 9 pieces of holographic foil Patented 3" diameter chrome-plated steel disk Creates a hypnotic display of light and sound as it rotates Includes Disk, 9" concave mirror base and 9 pieces of holographic foil Foil is magnetized Fascinating desktop illusions! Spin the holographic disk on the mirror. Does it speed up? Listen to its rhythmic sounds. Why does the humming get louder as the speed of the disk increases? This patented 3" Diameter chrome-plated steel disk creates a hypnotic display of light and sound as it rotates. Includes Euler's disk, 9" Concave mirror base and nine pieces of magnetized holographic foil. Complete with instructions and the scientific answers! From the Manufacturer Give the Euler's Disk! This patented 3" diameter chrome-plated steel disk creates a hypnotic display of light and sound as it rotates. Includes Euler's Disk, 9" concave mirror base and nine pieces of magnetized holographic foil. Euler's Disk Physics Toy ? Gadgetify Video will open in a new window Using the App? Paste link into a browser window: [isdntekvideo]