Thoreau, February 12, 1860

I walk over a smooth green sea, or aequor, the sun just disappearing in the cloudless horizon, amid thousands of these flat isles as purple as the petals of a flower. It would not be more enchanting to walk amid the purple clouds of the sunset sky. And, by the way, this is but a sunset sky under our feet, produced by the same law, the same slanting rays and twilight. Here the clouds are these patches of snow or frozen vapor, and the ice is the greenish sky between them. Thus all of heaven is realized on earth. You have seen those purple fortunate isles in the sunset heavens, and that green and amber sky between them. Would you believe that you could ever walk amid those isles? You can on many a winter evening. I have done so a hundred times. The ice is a solid crystalline sky under our feet. 

Whatever aid is to be derived from the use of a scientific term, we can never begin to see anything as it is so long as we remember the scientific term which always our ignorance has imposed on it. Natural objects and phenomena are in this sense forever wild and unnamed by us.