Figure 2.

3-D TOSA Target Models. Each item was made of blocks ranging in length from one unit (2 pips × 2 pips; pips are the knobs which lock the pieces together; measuring 32 mm long × 32 mm in width × 24 mm in height) to three units (2 pips × 6 pips; 32 × 96 × 24). Items 1 and 2 (top left) were at ceiling and not included in the total score for the 3-D portion of the test.