What is wider than life itself
Longer than forever
So simple it's complicated
Travels but never leaves the spot
Puts others in danger but no one gets hurt
And reaches to worlds unknown?
It's so strong, it does not break,
It's so powerful, it penetrates a lake,
Sometimes it's weak as a twig left out in the sun,
It's so wonderful it gives us the power to have fun.
What is it?