in Thoreau’s Journal:
Standing before Stacy’s large glass windows this morning, I saw that they were gloriously ground by the frost. I never saw such beautiful feather and fir-like frosting. His windows are filled with fancy articles and toys for Christmas and New-year’s presents, but this delicate and graceful outside frosting surpassed them all infinitely. I saw countless feathers with very distinct midribs and fine pinnæ. the half of a trunk seemed to rise in each case up along the sash, and these feathers branched off from it all the way, sometimes nearly horizontally. Other crystals looked like pine plumes the size of life. If glass could be ground to look like this, how glorious it would be!