What is a Circle?

Now, what is a circle?
Where can it be found?
I know what it looks like,
It goes round and round.
It could be a Frisbee
Or the top of a cake.
It could be a pizza
Or a cookie we baked.
It could be the tire
On a brand-new car.
It could be a button
Or the lid of a jar.
Now, what is a circle?
Well, you'll have to guess.
A circle is something
A little like this.  (Form circle with thumb and finger).
By Vicki Claybrook.  From 1001 Rhymes & Fingerplays For Working with Young Children. Totline Staff, comp. Everett, WA: Warren Publishing House, Inc. 1994.