(Apologies to any repeat recipients) (An active version of my G11 exchange gift.)

Stare at (don't click) the "infinite" periodic tessellation http://gosper.org/sqartri1.html . Can it be broken up (along color boundaries) into a tessellation by A) Regular hexagons? B) Squares? C) Equilateral triangles? D) None of the above? --Bill Answer: click on larger image (forward) and smaller image (back).