Roberto Gretter is an Italian origami folder with some amazing skill, as well as several common interests. His website features many original designs, including quite a few tessellations and geometric patterns.

Since I really have a fondness for geometric tessellated shapes, here’s several of his bowls- which he has also diagrammed, available for download at his site!

Also, here’s a link to one of my favorite designs of his- which he just calls “hexagonal tessellation“.