A young child climbing a boulder in which a balancing rock sits upon.
A human climbing
A young child could be a human.  A person could be climbing a boulder.
exists e1 e2 s1 s2 x1 x2 x3 x4 x5.(a_topic(x1) & Theme(e2,x5) & Actor(e2,x2) & v_climb(e2) & in(e1,x5) & n_boulder(x5) & a_upon(s2) & Manner(e1,s2) & Actor(e1,x3) & v_sit(e1) & n_rock(x3) & of(x3,x4) & n_balancing(x4) & (x1 = x2) & n_child(x1) & a_young(s1) & Theme(s1,x1))
exists s1 x1.(a_topic(x1) & n_climb(x1) & a_human(s1) & Theme(s1,x1))