Truchet 3x3

[url=https://drive.google.com/file/d/1r4wtLWkKCBjGEOei-17WysNXnwhCr_Gi/view?usp=sharing]Truchet stl file[/url] to print out.
Click on the center of each square to flip it and on the corners to rotate it.
source: [url=http://xahlee.info/math/Truchet_tiles.html]http://xahlee.info/math/Truchet_tiles.html[/url][br]accessed in 03.11.2018.
– Diego Lieban

Information: Truchet 3x3