Source google image: http://blog.eiffel-art-construction.fr/fil/2013/10/Capture-d%E2%80%99%C3%A9cran-2015-03-04-%C3%A0-16.44.06.png
Carrelage metro damier
Source google image: http://blog.eiffel-art-construction.fr/fil/2013/10/Capture-d%E2%80%99%C3%A9cran-2015-03-04-%C3%A0-16.44.06.png