The Euler disk was invented by Joseph Bendik and is used to visualize and study the dynamic system of a rotating disk on a flat or slightly curved surface.. If we take a currency in the same way, the rotation won't last long. Instead, the rotation of the Disk Euler's lasts much longer and this is mainly due to less friction because the glass surface, but the great mass of the disk. This phenomenon was studied first by the Leonard Euler in the 18th century, from where it gets its name.