Studieds by Ben Haim (1986) and Gaulin(1985) investigated the representations that middle school students use for three-dimensional objects. Gaulin asked 10-to -13-years-old children to reassemble the components of a standard SOMA cube and to record their solutions on paper so that they could be used as an aid in reconstructing the cube at sometime in the future. The SOMA cube puzzle consists of eight polycubical pieces that fit together to form a cube. The responses included coded layer plans, coded perspective drawing. “exploded views”of the sort used in motor-vehicle handbooks. And representations based on coordinated.