float horizon = 200

void setup() {
  size(500,500);
  frameRate(rate);
}

void draw()  {
  scene();
  bird();
  
}

void scene(){
  // making scene
  rectMode(CORNER);
  // sky
  fill(0,0,255);
  rect(0,0,500,horizon);
  // grass
  fill(100,255,0);
  rect(0,horizon,500,500); 
}