Relativity

Each color is perceived in relation to other colors. The top and bottom bars each contain the same component colors, but a different display order causes individual colors to appear differently.

from p5 import *

a = b = c = d = e = None

def setup():
        size(640, 360)
        no_stroke()

        global a, b, c, d, e
        a = Color(165, 167, 20)
        b = Color(77, 86, 59)
        c = Color(42, 106, 105)
        d = Color(165, 89, 20)
        e = Color(146, 150, 127)

        no_loop()


def draw():
        global a, b, c, d, e
        drawBand(a, b, c, d, e, 0, width/128)
        drawBand(c, a, d, b, e, height/2, width/128)

def drawBand(v, w, x, y, z, ypos, barWidth):
        num = 5
        colorOrder = [v, w, x, y, z]

        for i in range(0, width, int(barWidth*num)):
                for j in range(num):
                        fill(colorOrder[j])
                        rect((i + j*barWidth, ypos), barWidth, height/2)

if __name__ == '__main__':
  run()