Red and blue are over the rainbow and under the rainbow. Blue pill puts you under the rainbow, red pill puts you over the rainbow. This imagery is everywhere. Watch any Hollywood movie, The Shape of Water, Close Encounters, Yellow Submarine, The Wizard of Oz, … blue and green mean not knowing and white and red mean knowing.
Blue (idiots): blue meanies, blue fairy, Alice Blue …
Green (idiots): Emerald City, Soylent Green, …
Yellow (journeying): Curious Yellow, Yellow Submarine, Yellow Brick Road, …
Orange: (woke) Clockwork Orange
Red: (over the rainbow) Red carpet, The Angels Want My Red Shoes, The Man With One Red Shoe, ruby slippers, etc. … walking on top of the rainbow.
White: (fully illuminated) White Album, In the White Room, etc.
There are thousand more examples.