<iframe width='500px' height='400px' src='https://nest.ktbyte.com/nest#91251' allowfullscreen></iframe>

float ini_theta = 0;
float ini_omega = 0.02;

void setup() {
  size(800, 800);
}

void draw() {
  background(70);
  guruguru(350, 400, 200, ini_theta, ini_omega, 50, 20);
  ini_theta += ini_omega;
}

void guruguru( int cent_x, int cent_y, int r, float theta, float omega, int ellipse_size, int flag) {

  if (flag==0) return;
  else {
    flag += -1;
  }  

  // previous ellipse
  float pos_x = sin(theta)*r;
  float pos_y = cos(theta)*r;

  //drawing 
  fill(255, 255, 255, 20);
  ellipse(cent_x, cent_y, r*2, r*2);
  fill(255);
  noStroke();
  ellipse(cent_x, cent_y, ellipse_size, ellipse_size);
  stroke(255);
  line(cent_x,cent_y,pos_x+cent_x,pos_y+cent_y);
  

  // next ellipse 
  cent_x += pos_x;
  cent_y += pos_y;  
  theta += theta+omega;

  guruguru(cent_x, cent_y, r/2, theta, omega*2, ellipse_size/2, flag);
}