// Jarek's variations
void setup() 
{
  size(100, 200); 
 // noStroke();
  colorMode(RGB, 255, 255, 255, 100);
  rectMode(CENTER);
}

void draw() 
{   
  background(0); 
  fill(255,100,100, 100);
  rect(mouseX, height/2, mouseY/2+10, mouseY/2+10);
  fill(100,155,100, 50);
  ellipse(width-mouseX, height/3, ((height-mouseY)/2)+10, ((height-mouseY)/2)+10);
}