even small things, can make a very big difference

Yes, de Troy. Let us celebrate "small things which make a big difference" ... like the Bronx Zoo, a nearly miraculous oasis, which I have visited myself.

Too often we make a big thing out of a lot of things which make no difference at all.

What would St. Louis be without its arch?

What would Vancouver be without Stanley Park, or Manhattan without Central Park.

Certainly, these Parks are a small thing within the totality of their urban mass, but those urban areas are almost unthinkable without those Parks, at least unthinkable as leading centres of civilization.