A man is looking at artwork.
A man looking at a painting.
Painting and artwork are not necessarily the same thing
exists e1 x1 x2.(at(e1,x2) & n_artwork(x2) & Actor(e1,x1) & v_look(e1) & n_man(x1))
exists e1 x1 x2 x3.(a_topic(x1) & at(e1,x3) & n_painting(x3) & Actor(e1,x2) & v_look(e1) & (x1 = x2) & n_man(x1))