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This mobile consists of two circular elements composed of bronze rods. They radiate from a black wooden 'hub' at the centre, in the shape of a cylindroid, and are joined at the outer rim. One of the elements is horizontal and oscillates from the centre. The second element rotates around the centre, and, through the twist, makes an endless surface. The strip of metal along the outside edge also makes an endless surface. Originally the mobile was rotated with an electric motor. Kenneth Martin wrote that the mobile was 'an essay in repetitive rhythm. It is like a landscape which rotates around its centre of perspective - though this simile must not be taken too far'.