A marble sculptor is sculpting some kind of monster.
A marble sculptor is sculpting his worst nightmare.
the monster is not necessarily the sculptor's worst nightmare.
exists e1 x1 x2 x3 x4.(Theme(e1,x3) & Actor(e1,x1) & v_sculpt(e1) & of(x3,x4) & n_monster(x4) & n_kind(x3) & n_sculptor(x1) & of(x1,x2) & n_marble(x2))
exists e1 s1 x1 x2 x3.(Theme(e1,x3) & Actor(e1,x1) & v_sculpt(e1) & n_nightmare(x3) & r_most(s1) & a_bad(s1) & Theme(s1,x3) & of(x3,x1) & n_male(x1) & n_sculptor(x1) & of(x1,x2) & n_marble(x2))