The idea is if you use those two shapes and try to colour the plane with them so the colours match, then the only way that you can do this is to produce a pattern which never repeats itself.
-- Roger Penrose
   
Roger Penrose   Name:
Roger Penrose
Type:
Physicist
Nationality:
English
Birth:
August 8, 1931
https://www.nutquote.com/quote/Roger_Penrose