whiteout

float theta;
float diam = 70;
int num = 10;
color[] palette = {
  #FF0000, #00FF00, #0000FF
};

void setup() {
  size(500, 500, P2D);
  background(0);
  blendMode(SCREEN);
  noFill();
}


void draw() {
  //background(0);
  fill(0,1);
  noStroke();
  rect(0,0,width, height);

  strokeWeight(diam/2);
  float y = height/2;

  for (int i=1; i<num+1; i++) {
      stroke(palette[(i-1)%3]);
    float x = map(sin(theta), -1, 1, 0, width);
    ellipse(x, y, i*diam, i*diam);
    ellipse(width-x, y, i*diam, i*diam);
  }
  theta += 0.0523/3;


}