Like many of Gabo's drawings, these sketches relate directly to sculptures. In Sketch for 'Construction Through a Plane' (top), a rhythmic play of circular forms is generated from the central pierced diamond shape (shown hatched-in in pencil). In the finished sculpture these forms were made from loops of transparent plastic. Sketch for 'Spiral Theme' (bottom) establishes the boat-like form of the sculpture and the way it encloses space. These ideas were then developed in three dimensions in a model, shown in the vitrine, before being translated into the larger sculpture, also on display here.