Here is a first pass at trying multiple animations.
As you can see, there is a pink cloud that takes 20 secs to traverse the viewport along the X access.
But there is also a 4 animations (small leaf, right leaf, left leaf, big leaf) that each have an animation delay (not a transition delay) of 4 seconds, and a total animations duration of 20 secs.
Theoretically, everything should sync up every 20 seconds.
This is not what happens.
Why is this happening?
And how to fix it?