Ivory abstract netsuke
Attributed to Ono Ryomin
A pleasing ying-yang carved in three dimensions, occasionally said to represent a rice cake (mochi), though to my mind more similar to the shape into which the Japanese cut chestnuts.
Early 20th century
Compare with a similar netsuke, signed Ryomin, formerly in the Walter Behrens collection and illustrated with a drawing in Meinertzhagen’s Card Index, MCI, p. 658