I alternate my aims; at one time, I concentrate on poetry, on a more expressionist kind of sculpture; at other times on form – I mean on a kind of sculpture that concerns itself with formal relations rather than emotions or ideas. I suppose that this principle of alternating my aims leads to a kind of oscillation in the evolution of my own particular style as a sculptor, but I feel that it prevents me from repeating myself.

Circa 1960. Dialogues – conversations with European Artists at Mid-century, 1990, p. 154