This is Euler's disc. Sound on. : r/nextfuckinglevel

PDF] The ringing of Euler's disk

The Euler's Disk - A spinning disk which creates one of the coolest sounds I've ever heard : r/videos

e^(ix)=cos(x)+i*sin(x) : r/EngineeringStudents

Euler's Disc: Spinning disc goes for minutes!

SoundsLikeMusic

Eulers Disc

Spin science into art: Euler's Disk is a chrome-plated steel disk that produces a captivating sonic hum and a magical holographic display; swap

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

SoundsLikeMusic

PDF] The ringing of Euler's disk

Conan experience on PS4 (our friend was stuck in the stone) : r/ConanExiles