This rank impossibility by Kokichi Sugihara won second prize in the Neural Correlate Society’s 2016 illusion of the year contest.

The key is that the top of each cylinder is not a planar curve. Dickinson College mathematician David Richeson has created an interactive applet that you can use to examine the shape, and see his paper below for an explanation of the math and the template of a paper model.

(David Richeson, “Do the Math!: Sugihara’s Impossible Cylinder,” Math Horizons 24:1 [September 2016], 18-19.)