This is a small stamp with blue skies and white lines with green bushes.
the stamp is plain
If the stamp is plain it would not contain blue skies and white lines with green bushes.
exists p1 x1.(n_thing(x1) & exists s1 s2 s3 s4 x2 x3 x4 x5 x6.((x1 = x2) & with(x2,x3) & subset_of(x5,x3) & with(x5,x6) & n_bush(x6) & a_green(s4) & Theme(s4,x6) & n_line(x5) & a_white(s3) & Theme(s3,x5) & subset_of(x4,x3) & n_sky(x4) & a_blue(s2) & Theme(s2,x4) & n_stamp(x2) & a_small(s1) & Theme(s1,x2)))
exists s1 x1.(n_stamp(x1) & Theme(s1,x1) & a_plain(s1))