All kids get a square drawing sheet of 21 by 21 cm. On this sheet they draw concentric circles with a compass. The eyes of the circles always have to be at the edge of the sheet. The circles are coloured with markers of colour pencils in maximum 5 colours. When ready, cut the drawing in four squares of 10,5 by 10,5 cm. By rotating the four parts, a beautiful composition can be made. Paste those four pieces on a coloured background, leaving 1,5 cm between the squares.