Using various shades of grey, Charlton has made monotone paintings since 1969. He intends the work to have no metaphorical or spiritual content but simply to assert the fact of its existence. Charlton devised a system for determining the sizes of his paintings based on the unit of 2 inches, the depth of the stretcher bars he employed. In 1978 he adopted its metric equivalent, 4.5cm, which also forms the basis for this portolio of prints. The smallest square is 9cm and rises by 4.5cm increments to the largest which is 49.5cm. The paper itself is 58.5cm. All the grey tones are precise duplications of the tones Charlton has used in his paintings since the early 1970s. The works are intended to be hung in a random order.