The Plan:
The guy is casually standing around when, out from behind the tree, a huge beetle comes walking out. The guy is surprised --he spins around and moves backward and says "Aiii!".
After that a cartoon "beetle" (his name is Ringo Beetle ) steps out from behind the tree and apologizes saying that the leash has come off of his pet beetle.
The End
That's the end of our story. What should that look like? Some people may be able to imagine what a scene of this written description would look like. But English can sometimes be interpreted differently by different people -- it can be hard to be really precise.
For example, when we say The guy is surprised -- he spins around and moves backward and says "Aiii!". Is he supposed to be spinning and moving at the same time? Or spin then move? And does he yell "Aiii!" immediately? Or after he's done moving? The English isn't completely clear.
Professional animators use a special tool -- called storyboards -- which help them express what exactly should happen in more detail -- but without writing the actual code to do it. Let's be more specific about what we want by creating a storyboard. Let's assume all the actions we want to happen should be done one thing at a time.
The Storyboard:
Here's our storyboard. In making this, we made some additional decisions to be more precise about what we want to happen:
Do these things in order
beetle moves out from behind the tree
guy spins around once
guy moves backward
guy says "Aiii!"
ringoBeetle moves out from behind the tree
ringoBeetle says "Sorry, his leash came off."
This storyboard makes it clearer that each action should happen one at a time -- because all the instructions are listed under a Do these things in order. Note: the instructions are indented (moved right a bit) under the Do these things in order.
If you want a better idea of what we're hoping to create, play this video that shows the animation we will be building.