semantic categorisation and movement

[Michael A. Lebedev, Ph.D.]

An alternative interpretation:

Pictures with living objects are just the one that can be recognized
easier.  All these rabbits, elephants, ducks etc. are less living
objects per se than they are symbols that we encounter every day in our
lives (merchandise symbolics, cartoons, etc.).  On the other hand, the
non-living objects that you showed might have been from a less
frequently used set of symbols.

Michael