Triangle Grid: Instructions | Happy Folding Posted by imus on September 20, 2011 Posted in: Crafts-Hobbies, Photography, Technology, Uncategorized. Triangle Grid: Instructions | Happy Folding. PDF –> Tessellation Basics booklet now available – free PDF! | Origami Tessellations. Posts navigation ← What does it feel like to fly over planet Earth? – YouTube toad, greenway walk, home, playing on the computer, beer and bedtime →