A variety of art displayed on the city streets.
Something is being shown outside
The displayed art could be inside building windows and not outside.
exists e1 x1 x2 x3 x4.(n_street(x3) & of(x3,x4) & n_city(x4) & on(e1,x3) & Theme(e1,x1) & v_display(e1) & of(x1,x2) & n_art(x2) & n_variety(x1))
exists e1 s1 x1.(a_outside(s1) & Manner(e1,s1) & Theme(e1,x1) & v_show(e1) & n_thing(x1))