A street artist is at work.
An artist is playing video games.
Doing work and playing video games are different things.
exists p1 x1 x2.(exists x3.(at(x1,x3) & n_work(x3)) & n_artist(x1) & of(x1,x2) & n_street(x2))
exists e1 x1 x2 x3.(Theme(e1,x2) & Actor(e1,x1) & v_play(e1) & n_game(x2) & of(x2,x3) & n_video(x3) & n_artist(x1))