People painting each others arms bright colors.
The people are doing an experimental art project using the human body as a canvas.
Just because they paint each others arms bright colors does not mean it is for an experimental art project.
exists e1 x1 x2 x3.(r_bright(e1) & Time(e1,x3) & n_color(x3) & Actor(e1,x1) & v_arm(e1) & all x4.((-(x4 = x1) & n_person(x4)) -> exists e2.(Theme(e2,x4) & Actor(e2,x2) & v_paint(e2))) & n_person(x1) & (x1 = x2) & n_people(x1))
exists e1 e2 s1 s2 x1 x2 x3 x4 x5 x6.(n_body(x5) & a_human(s2) & Theme(s2,x5) & n_people(x1) & Theme(e2,x2) & Actor(e2,x1) & v_do(e2) & as(x2,x6) & n_canvas(x6) & Theme(e1,x5) & Actor(e1,x4) & v_use(e1) & (x2 = x4) & n_project(x2) & of(x2,x3) & n_art(x3) & a_experimental(s1) & Theme(s1,x2))