Motoi Yamamoto creates these amazing designs with loose salt, or salt baked into bricks for large structures. He started using salt as his only medium when his sister passed away from brain cancer twelve years ago, and he looks at his labyrinth-esque art as at once futile yet necessary to his healing. It’s also interesting to note that in Japanese culture salt is often considered a symbol of purity.
See a nice interview with Motoi here.
Via here & here.