Largest Volume for Smallest Surface
Of all the shapes, a sphere has the smallest surface area for a volume. Or put another way it can contain the greatest volume for a fixed surface area.
Example: if you blow up a balloon it naturally forms a sphere because it is trying to hold as much air as possible with as small a surface as possible. Press the Play button to see.
In Nature
The sphere appears in nature whenever a surface wants to be as small as possible. Examples include bubbles and water drops, can you think of more?
