On this video there is a cool animation where a line moves across the screen and then a circle attached to this line pauses on the screen. There is a picture in the circle. The viewer has a chance to see the circle with the picture in it, then the line continues moving to the left until another circle/picture comes into view. Is this done by creating the entire line off stage then motion tweening it onto the stage or is it done by setting up different scenes or some other way? I'm just looking for opinions. The effect that I'm describing begins at about the 8 second mark on this youtube video. Thanks very much !