A young child playing with a toy while laying on the floor.
Child playing catch
The game of Catch is usually played while standing or running.  It is also usually played outdoors, not on a floor.
(x)
exists x1 x2 x3.(n_catch(x1) & of(x1,x3) & n_playing(x3) & of(x1,x2) & n_child(x2) & a_topic(x1))