Bricard A, Caussin JB, Desreumaux N, Dauchot O, Bartolo D.
Nature. 2013 Nov 7;503(7474):95-8. doi: 10.1038/nature12673
Emergence of macroscopic directed motion in populations of motile colloids.
Device made of glass slides glued by double-face Scotch tape cut with Graphtec Robo CE 5000.