Open shell Katatsugai A comparison of Genroku poems and shells (series title) Genroku kasen kaiawase (series title on object), Two court ladies in clothing from the Heian period (794-1185) sitting by a cage with a pheasant. A mirror hangs on the cage. The shell to which the title refers is depicted in the fan-shaped cartouche. With three poems, walker and runner birds: pheasant, Katsushika Hokusai (mentioned on object), Japan, 1821, paper, colour woodcut, h 193 mm ⊙ w 176 mm.