In Latin, tessella is a small cubical piece of clay, stone or glass used to make mosaics. The word "tessella" means "small square" (from "tessera", square, which in its turn is from the Greek word for "four"). It corresponds with the everyday term tiling which refers to applications of tessellations, often made of glazed clay. [from wikipedia]I made one. It started to make many pre-creases in accordion manner, then after many folds an fascinating design appeared.
Eric Gjerde, fantastic inspiring origami aritst, his first book "Origami Tessellations". It took me 2 hours to get to this point but I wasn't tired, too much fun to stop.
It's done. Let's put the light again.