Here is the thing. There was a bumper crop of acorns the previous fall. No one thought much of it at the time--some years there are many, some years few. But then spring came, and those acorns all sprouted and grew, sure and strong. They linked their seedling arms, their sapling arms, as they reached for the sun. The roadsides disappeared, then the roads. Houses and towns were swallowed up, in just one season.
You have to be careful with acorns. Out of little acorns mighty oaks do grow.

Photo: Bur oak seedling by Todd Dwyer on Flickr