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int dim; void setup() { size(640, 360); dim = width/2; background(0); colorMode(HSB, 360, 100, 100); noStroke(); ellipseMode(RADIUS); frameRate(1); } void draw() { background(0); for (int x = 0; x <= width; x+=dim) { drawGradient(x, height/2); } } void drawGradient(float x, float y) { int radius = dim/2; float h = random(0, 360); for (int r = radius; r > 0; --r) { fill(h, 90, 90); ellipse(x, y, r, r); h = (h + 1) % 360; } }