//draws lines, ellipses, and rectangles with some random values
//over time more shapes are added
void setup(){
size(400,400);
frameRate(30);
}
void draw(){
for(int x=50;x<400;x+=25){//x is from 50 to 400 by 25s
  float y=random(50,150);//y is a random from 50 to 100
  float z=random(50,150);
if(x>100){//when x is greater than 100
  if(x<300){//when x is greater than 100 and less than 300
    ellipse(z,y*1.5,36,36);//draw an ellipse
    delay(500);
  }else{//when x is greater than 100 and greater than 300
    line(y+z,y,y+10,z+25);//draw a line with random coordinates
  }
}else{//when x is less than 100
  rect(z+30,z+50,y+10,y+10);//draw rectangle
}
}
}