Fig 2. Drawings in relief of the Bar, Cross and Tomahawk sticks and the matching trays presented to two, three and four year-old children.

The perpendicular arm of the tomahawk was triangular in shape on one side of the long arm. Each side of the triangle was 4.7 cm in length. The long shaft of the stick was 11.5 cm long, and 1 cm in cross-section. The Bar and Cross sticks, and the trays with cut outs matching these other shapes, were of similar dimensions.