UFO

 Repetition: The little green points on the floor, and those orange circles on the triangle。Also, that rectangle light shoot out from that ufo。

 Balance： I think that pyramid show a stable balance，also two ufo fly on the sky show a balance of control pyramid。

 Variety：here has trangle，rectangle， circle，oval，and semicircle many variety shapes。

  Focal point：My focal point is color。It only use a large black to be background，it use most yellow color display right on the middle，and whole floor， only person and two ufo are use red color。In addition，all objects‘s edge are cover with green。