DESIGN. ENGINEER. MULTIPLY OPTICAL PERSPECTIVE ILLUSION. COMPOSITION. TRIGONOMETRY. PHYSICS. REFRACTION. REFLECTIVE. REFRACTIVE. SUSPENDED ANIMATION. REALISM. ORNATE. DETAIL. Sumo wrestling is a Japanese sport with a rich history, often called Japan's national sport. It's a form of full-contact grappling where two wrestlers, or rikishi, compete in a circular ring (dohyō) to force their opponent out of the ring or make them touch the ground with any body part other than their feet. See more