Cetacea and two (external) limbs that are modified into flippers. Though not as flexible or agile as seals, cetaceans can swim very quickly, with the killer whale able to travel at in short bursts and the fin whale able to cruise at . Dolphins are able to make very tight turns while swimming at high speeds. The hindlimbs of cetaceans are internal, and are thought to be vestigial. Baleen whales have short hairs on their mouth, unlike the toothed whales. Cetaceans have well-developed senses—their eyesight and hearing are adapted for both air and water, and baleen whales have a tactile system
Two Forms (Divided Circle) fire at her studio in St Ives in 1975. It includes two vertical bronze semi-circles forming a broken circle approximately across, each pieced pierced by one large hole. Both elements are welded to a bronze base. All three elements are hollow, and were cast in London by Morris Singer. Hepworth designed the work after being diagnosed with cancer in 1966. She wanted the viewer's body to be engaged with her work, saying: "You can climb through the Divided Circle – you don't need to do it physically to experience it." Hepworth also made a series of nine maquettes about tall,