Thoreau writes in his journal:
In the side of the high bank by the Leaning Hemlocks, there were some curious crystallizations. Wherever the water, or other causes, had formed a hole in the bank, its throat and outer edge, like the entrance to a citadel of the olden time, bristled with a glistening ice armor. In one place you might see minute ostrich feathers, which seemed the waving plumes of the warriors filing into the fortress, in another the glancing fan-shaped banners of the Lilliputian host, and in another the needle-shaped particles, collected into bundles resembling the plumes of the pine, might pass for a phalanx of spears. The whole hill was like an immense quartz rock, with minute crystals sparkling form innumerable crannies. I tried to fancy that there was a disposition in these crystallizations to take the forms of the contiguous foliage.