This animation is here to remind you that symbols aren't
just around to help you move things, but they are also used
to help decrease the file size. Instead of creating many
different objects that all look about the same, I can use
symbols.
For instance, instead of drawing each individual
set of eyeballs,
I can simply draw one white oval and define it as a symbol.
Then draw a black circle and define it as another symbol.
Then I repeat different instances of the two symbols to
make all
the different eyeballs.
Symbols can be sized or distorted
or rotated to make different looks.
