Escher used black and white. High contrast, which dramatized his art and also brought more attention to what he was drawing, not just the colours.
His “impossible constructions” were shocking. He played with perspective and juxtaposition in a way that couldn’t possibly be true in real life. The audience has to do a double take. Angles and shapes were twisted in impossible ways.
He applied discipline and order to the impressionists' spontaneous use of color .
Hippodamus is the answer. He was a Greek city planner that had a scheme in organizing Athens via rectangular blocks. However it was different as the rectangular scheme would then allow the invaders to get inside easily.Hope this is the answer.