In his cozy workshop behind his D.C. home, contemporary kumiko craftsman David Gootnick, a Craft Show featured artist, uses the raw material of his practice: a five-foot-long, two-inch-thick plank of ...

But Penrose, inspired by Escher (who was in turn fascinated by the intricate Islamic mosaics of the Alhambra in Spain), came up with various “non-periodic” tiling patterns, using pentagons ...