0,0 should be a red rectangle with a black background
1,0 should be a very small green rectangle (top left)
2,0 should be a blue rectangle with a black background
3,0 should be a yellow square (half the size of the rectangle)
4,0 should be a magenta half-square (missing right half)

0,1 should be identical to 0,0
1,1 should be a green rectangle identical, in shape, to 3,0
2,1 should be a very small blue rectangle (top left)
4,0 should be a yellow half-square (missing right half)
3,1 should be a magenta rectangle identical, in shape, to 3,0