Actually just a sheet of paper.

Colossal is an online art magazine that celebrates contemporary art and visual culture across a wide range of creative disciplines. Art by humans, for humans. There you will always find unique art projects that inspire reflection and amazement. Recently, an article entitled “An M.C. Escher-Inspired Series by Parth Kothekar Distorts Perspectives With Single Sheets of Paper” was published, showing how three-dimensional objects can be cut from a single sheet of paper.