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In 1964 Moon changed from using oil paints to acrylics, which he preferred for their flat finish and consistent colour. In Hoop-La the colours create an optical illusion where the blue dots appear to produce after-images on the red ground. This perceptual trick generates a sense of movement which is further enhanced by the cropping of the blue dots. The asymmetrical arc arrangement of these elements makes the whole composition seem to rotate.

May 2007