Penrose Tribar, optical illusion, impossible triangle, maths T-Shirt
- Optical illusion, Penrose, triangle, math, design for all who love impossible figures, Tribar, sign, symbol, Escher, art, puzzles, geometric shapes, formula, number, object, polygon, platonic solids, fibonacci, mathematics, geometry, sci-fi, Möbius strip..
- Gifts for friend, teacher, team, mathematician, physicist, math teacher, birthday, Christmas, school, university, high school, graduation, travel, electro, music, festival, party, nerd, geek, gamer, pi day, t tshirt, funny, cool, gadget, tattoo, pattern..
- Lightweight, Classic fit, Double-needle sleeve and bottom hem.