A girl and a guy sitting on large cubes.
They are modeling for the photographer
modeling is different from sitting
exists e1 s1 s2 x1 x2 x3 x4.(a_topic(s1) & subset_of(x2,s1) & on(e1,x4) & n_cube(x4) & a_large(s2) & Theme(s2,x4) & Actor(e1,x3) & v_sit(e1) & (x2 = x3) & n_guy(x2) & subset_of(x1,s1) & n_girl(x1))
exists e1 x1 x2.(n_photographer(x2) & n_thing(x1) & for(e1,x2) & Actor(e1,x1) & v_model(e1))