As long as you have both Handrawn's picture and the tutorial as a reference, I don't see why anyone can't—with a little trial and error—come up with a faithful animated representation of a bouncing ball with Earth gravity.

That wasn't the point of the tutorial—I wanted to get people interested in a verifiably underused Xara feature, and cartoonish exaggeration—which has been used in animation studios for 70 years (squash and stretch cartoon physics)—felt like a good entry point for me to use.

When I suggested viewers perform variations on what I showed—a bouncing chair or something bouncing while changing colors—well, an accurate representation of a ball bouncing and losing energy ultimately, is a good variation, too!

My Best,
—Gary