Penrose Pattern Generator

 From:  Frenchy Pilou (PILOU) 7 Sep 2015  (4 of 4) 
7599.4 
http://www.entrelacs.net/-Celtic-Knotwork-The-ultimate- by hand

With computer ;)
http://www.hypatiasoft.fr/Folder_KnotsBag/Pages_HTML/KnotsBag_A.html

EDITED: 7 Sep 2015 by PILOU