int MAX = 150;
float[] x = new float[MAX];
float[] y = new float[MAX];

void setup() {
  size(1000, 700);

  noStroke();
  for (int i = 0; i < MAX; i++) {
    x[i] = mouseX;
    y[i] = mouseY;
  }
}

void draw() {


  for (int i = 0; i < MAX-1; i++) {
    x[i] = x[i+1];
    y[i] = y[i+1];
  }

  x[x.length-1] = random(1000);
  y[y.length-1] = random(700);

  for (int i = 0; i < MAX; i++)
  {
    fill(i + 0, 100, 200);
    ellipse (x[i], y[i], 30 + i, i);
    ellipse (x[i], y[i], 20 + i, i);
    ellipse (x[i], y[i], 10 + i, i);
    ellipse (x[i], y[i], 30 + i, i);
    ellipse (x[i], y[i], 20 + i, i);
    ellipse (x[i], y[i], 10 + i, i);
  }

}