[Colour Theory] Rectangular Tetradic Colours

I'll be looking at two Tetradic Schemes - Rectangular and Square. In both, we use 2 sets of Complementary Colours for a total of 4 colours. The difference between Rectangular and Square is how far apart the colours are spread. We have the benefit of more colours to paint with, however it becomes harder to balance all of them cleanly. The Rectangular scheme is easier to work with than