A man is operating a piece of machinery.
A man is looking at a museum filled with machinery.
To be using the machinery is an active experience with it, whereas looking at it at a museum is a passive experience.
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_operate(e1) & of(x2,x3) & n_machinery(x3) & n_piece(x2) & n_man(x1))
exists e2 e1 x1 x2 x3 x4.(at(e1,x2) & with(e2,x4) & n_machinery(x4) & Theme(e2,x3) & v_fill(e2) & (x2 = x3) & n_museum(x2) & Actor(e1,x1) & v_look(e1) & n_man(x1))