Children are doing various things in the pic, eating and posing.
The picture was invisible.
There cannot be children in the picture if it is simultaneously invisible
exists e1 s1 x1 x2 x3 x4 x5 x6.(n_pic(x3) & Theme(e1,x2) & Actor(e1,x1) & v_do(e1) & rel(x2,x4) & n_posing(x6) & n_eating(x5) & subset_of(x6,x4) & subset_of(x5,x4) & in(x2,x3) & n_thing(x2) & a_various(s1) & Theme(s1,x2) & n_child(x1))
exists s1 x1.(n_picture(x1) & Theme(s1,x1) & a_invisible(s1))