2D Random "Art" - Complementary Colors are pleasing

Idea: Divide the x- and y-axis in random sized sections. Fill the 1st rectangle with a random color, fill its neighbor to the right with its complementary color. Fill the 3rd rectangle with another random color, fill the 4th rectangle with...

Take Away's:

• JS sort() sorts the array by the first CHAR of array[i], not the whole integer :-S
• Coding the x-axis sections / reading them out right --> take your time.