A man working on a contraption in an abandoned warehouse.
A mad scientist is building something.
Just because he is working on a contraption does not imply he is a mad scientist.
exists e1 s1 x1 x2 x3 x4.(a_topic(x1) & in(e1,x4) & n_warehouse(x4) & a_abandoned(s1) & Theme(s1,x4) & on(e1,x3) & n_contraption(x3) & Actor(e1,x2) & v_work(e1) & (x1 = x2) & n_man(x1))
exists e1 s1 x1 x2.(Theme(e1,x2) & Actor(e1,x1) & v_build(e1) & n_thing(x2) & n_scientist(x1) & a_mad(s1) & Theme(s1,x1))