Mathematicians define "tessellate" as covering a plane with a pattern, and it is a concept that interests scientists and artists, as well as mathematicians. Join me for a fun tour.
Curiosity spurred nature artist Marjorie Rice (with no formal training beyond high school mathematics) to discover four new tessellating pentagons in the late 1970's.
Japanese artist Makoto Nakamura has taken tessellations a step beyond the plane with his awesome animations.
If all this tessellated art has you eager to create your own patterns, take a look at this cool tool from Boxer Math.
This Math Forum page is a great introduction to tessellations for those who know some geometry.