Image credit: Utagawa Kuniaki II, 1835 - 1888 (Japanese), Ōzumō Keiko no zu [Professional Sumo Wrestlers Practicing], 1866, woodcut on paper, 13 3/4 x 9 1/2 inches. Gift of Special Collections, Norlin ...

Sumo wrestlers in Japan have been banned from growing "indecent" beards under new rules on grooming and appearance. Some wrestlers in the ancient sport say beards can bring them good luck.