Donut Quarto is a kinetic art object by
Daniel Piker. The object has four pieces of chain closely linked together. Still, the whole can rotate inside-out.
Watch the
YouTube video.
Please order a 3D-printed do-it-yourself puzzle kit from Shapeways at this page (check with Oskar about screws and stickers), or
contact Oskar directly if you are interested in obtaining a fully colored, stickered and assembled sample of this puzzle.