The Metzler and Shepard (1974) results were delived from adult subjects for whom isometric representations are apparently internalized as mental images in the same way that actual solids would be. Children,however,have far less experience of isometric drawing and may find them more difficulty to interpret than the solids that they represent. Bem Haim, Lappan,and Houang(1985)have demonstrated that 10-to-13-year-old children often experience difficulty in relating perspective drawing of three-dimensional objects t the rectangular solids that they represent.