A person's silhouette is dancing in the ocean as the sun sets in the background.
No one is dancing by the ocean.
If there is no one dancing by the ocean there cannot be a silhouette of anyone moving as if dancing, as it requires an actual person to create the silhouette.
exists e1 p1 x1 x2 x3 x4 x5.(n_background(x5) & n_sun(x4) & n_ocean(x3) & exists e2.(in(e2,x5) & Actor(e2,x4) & v_set(e2)) & as(e1,p1) & in(e1,x3) & Actor(e1,x2) & v_dance(e1) & n_silhouette(x2) & of(x2,x1) & n_person(x1))
exists x2.(n_ocean(x2) & -exists e1 x1.(by(e1,x2) & Actor(e1,x1) & v_dance(e1) & n_one(x1)))