PATIENT 1 - a young boy of ten-twelve years; was discharged from hospital one week after operation. He is in his bedroom, surrounded by wooden objects and shapes on paper.
BOY: Depth? What is depth?
DOCTOR: Depth is the third dimension, other than length and width. (motions with hands)
BOY (bemused): Dimension?
DOCTOR (holds drawing of square and a wooden cube): This drawing has two dimensions: length and width. This wooden cube has three, including height.
BOY (struggles to reach wooden sphere): This is depth? (holds sphere with both hands, ogling)
DOCTOR: No, that is roundness. The sphere has depth, though.
BOY: I don't understand.
PATIENT