Has one object in each pair been rotated, or is the second drawing of a different object? If you mentally rotate each of the paired objects, you can "match them up" to tell. This mental task takes longer and requires more intentional concentration than the task in the first exercise. The ability to do it also varies greatly from one individual to another.

Illustration is from The Universe Within: A New Science Explores The Human Mind. Morton Hunt. Simon and Schuster, New York. 1982.

(The objects in A and B are the same, one of them rotated. The objects in C are different.)

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