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Urn, Sketch for an Imaginary Construction (Logan Rock) (left) was made in preparation for one of Gabo''s rare paintings of the 1930s. The delicately enclosing curves form a vessel. The term 'logan rock' is a Cornish name for a boulder whose base has eroded, allowing it to be rocked back and forth. The later Sketch for Kinetic Construction (right) shows Gabo further exploring the use of enclosing lines and balance.