One hollow marble cylinder and three identical marble balls,

1920/1972

cylinder 15 1/4 x 6 3/8 x 6 3/8 in. (38.7 x 16.2 x 16.2 cm)
each ball diameter 6 3/8 in. (16.2 cm)

incised with initials and numbered 141/500 on the cylinder, conceived in 1920 and executed in 1972.