charles river frozen

In mid-winter, Charles river is beautifully frozen. The river itself becomes a mirror with a high purity, and catches even the smoke floating from the chimney over there.
A little stone thrown on its face can't break the ice, but slides on it to the center of the river. The ice seems to be thick.
I just stop to throw stones on the river, then, walk to the chimneys. I do not know what kinds of factory the chimney belongs to, even after passing it.
My designation is "whole foods", a supermarket. Once I and my spouse bought a nice grape in that supermarket, so even in winter, I often walk to look for the exact same bunch of grape.
Here is Cambridge, MA, USA