satifying

float angle, size;

​

void setup() {

  fullScreen();

  background(0);

  stroke(255,0,0);

}

​

void draw() { 

  angle += 0.2;

  size += 2;

  if (size > 450) {

    stroke(random(255),random(255),random(255));

    size = 0;

  }

  strokeWeight(10);

  point(width/2 + sin(angle)*size, height/2 + cos(angle)*size);

  point(width/2 + sin(angle+PI)*size, height/2 + cos(angle+PI)*size);

  point(width/2 + sin(angle+PI/2)*size, height/2 + cos(angle+PI/2)*size);

  point(width/2 + sin(angle+PI*1.5)*size, height/2 + cos(angle+PI*1.5)*size);

}

​