Area = a3 / Screen = 4x4
  1x1   1x2   2x2   3x3   Now
AREA_a2 AREA_a3 AREA_a4 AREA_a5
AREA_b2 AREA_b3 AREA_b4 AREA_b5
AREA_c2 AREA_c3 AREA_c4 AREA_c5