Perpetual Motion with Google Slides

How'd they do this??!!

Red Ball demo.mp4
Red Ball Challenge

One pass across the screen will take 25 slides.  

If everyone hits "play" at the same time, all the balls will bounce at the same time! 

 How will you get the middle Chromebook to wait for the first?  And the 3rd to wait for the other 2?

Your challenge:

Fish2.mp4
Earth.mp4

Ready to publish?  Here's how!

Publish Perpetual Animation.webm