How many slams in an old screen door?
Depends how loud you shut it.
How many slices in a bread?
Depends how thin you cut it.
How much good inside a day?
Depends how good you live 'em.
How much love inside a friend?
Depends how much you give 'em.

Although the environment is already given, you can inject life into it because the output will be different depending on the input. It's your choice what to do with the given environment. The poem is about living your life to the fullest and being aware of how unique your life can be. So, our group used tiny characters and how they interact with the world in a different dimension as the framing device.