Japanese paper crafter Haruki Nakamura designs mechanical paper karakuri-style animals and other paper automata. In the silent video above, he creates a cube made from 12 interlocking paper gears. Nakamura has also created a paper gear heart, as seen in the video below. He sells the 3D printing data for both the cube and the heart. See 3D printed versions of the heart, cube, and a rabbit in action below: See more of Nakamura’s surprising work on this site, as well as more papercraft videos like easy paper card pop-up tutorials for kids, Engineering the Perfect Pop, and Paper Folding with Matt Shlian and Sesame Street. Bonus: Three Gears are Possible and Gears of All Shapes.