Edit in JSFiddle

<script type="text/paperscript" canvas="myCanvas">
    //Square
    var path = new Path();
    path.strokeColor = "black";
    
    path.add(
    new Point(0,0),
    new Point(100,0),
    new Point(100,100),
    new Point(0,100)
    );
    
    path.closed = true;
    
    path.fullySelected = true;
    
    //move
    path.position.x += 50;
    path.position.y += 50;
    
    //Circle
    //copy
    var copy = path.clone();
    copy.fullySelected = true;
    copy.position.x += 150;
    
    //smooth
    copy.smooth();

</script>

<canvas id="myCanvas" resize></canvas>