The two demonstrations above show a user constructing simple dynamic scenes. In the scene on top, he is making an image that resizes with points placed at its corners and rotates by an angle equal to the distance between two points.

In the movie below a user is simply making a bit of text that reads "size," whose size is dependent on the distance between two points.

These kinds of parametric relationships are easy to establish and modify in Moment because they are represented clearly in a directed data-flow graph that is built and modified along with the scene (the window on the right side in each of these movies).