Gabo is probably best known for his geometrical constructions in plastics and metals. But this unusual sculpture demonstrates his interest in more organic forms. It resembles a ridged shell, perhaps the curved spiral of an ammonite fossil. When Gabo lived in England from 1936-46, he spent much of his time with his friends, the artists Ben Nicholson and Barbara Hepworth, at St Ives on the Cornish coast. He became a keen collector of stones and pebbles found during walks along the beach.