The goal of the task is to find the second part of the square. To succeed, the child must mentally combine the shapes and check the resulting figure. This is a classical task used in scientific papers to test levels of spatial thinking.

Level "Novice": simple cuts, many differences in the proposed answers.
Level "Pilot": more complex cuts, smaller differences in the proposed answers.
Level "Racer": complex cuts, small differences in the proposed answers.

— Spatial relations
— Mental manipulation of objects