Williams is a well known British sculptor. This drawing is one of a group acquired by the museum in 1974, as studies for prints. The images suggest Williams' then interest in spatial illusion, created by reflection, which also appears in his sculpture of the time. The work has a witty edge and the surrealist imagery of Magritte, and the work of M.C.Escher, whose impossible and fantastical constructions play on quirks of perception, may also have been influential at this time. Here, a toy train appears simultaneously to be both a reflected half circuit and a complete circuit.