Tate St Ives has been running a successful show of the work of the major constructivist sculptor Naum Gabo since mid-July and continues until 13 October. The fact that Gabo had no truck with dealers or commercial galleries during his lifetime inhibited his fame earlier, but today his reputation grows. Gabo also pioneered kinetic sculpture and his spirals, conceived in translucent plastic and delicately spun metal, remain timeless. His work also for a time influenced Barbara Hepworth. Parallel to this exhibition, well worth a visit now that the summer frenzy of the Cornish coast is subsiding, is an excellent display by Richard Long, and work by the Japanese installation artist Kosho Ito.