People looking at fish at an aquarium.
The people are visiting the aquarium.
looking at doesn't always mean visiting
exists e1 x1 x2 x3.(at(e1,x2) & at(x2,x3) & n_aquarium(x3) & n_fish(x2) & Actor(e1,x1) & v_look(e1) & n_people(x1))
exists e1 x1 x2.(n_aquarium(x2) & n_people(x1) & Theme(e1,x2) & Actor(e1,x1) & v_visit(e1))