Relativity

/**
 * 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. 
 */
 
int a, b, c, d, e;

void setup() {
    size(640, 360);
    noStroke();
    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);
    noLoop();  // Draw only one time
}

void draw() {
    drawBand(a, b, c, d, e, 0, width / 128);
    drawBand(c, a, d, b, e, height / 2, width / 128);
}

void drawBand(int v, int w, int x, int y, int z, int ypos, int barWidth) {
    int num = 5;

    int colorOrder[5] = { v, w, x, y, z };

    for (int i = 0; i < width; i += barWidth * num) {
        for (int j = 0; j < num; j++) {
            fill(colorOrder[j]);
            rect(i + j * barWidth, ypos, barWidth, height / 2);
        }
    }
}