Each of the forms, although different, has the same basic shape. Just as in a backbone which may be made up of twenty segments where each one is roughly like the others but not exactly the same…This is why I call these sculptures Vertebrae. The two or three forms are basically alike but are arranged to go with each other in different positions. The sculptor’s life is one of thinking, reacting, or making, expressing himself through form, through shape – for me the three-dimensional world is unending.
Henry Moore quoted in Henry Moore Sculpture, Edited By David Mitchinson, Arthur.A.Bartley 1988, page 204.