its hypaethral character
...Thoreau's Journal: 29-Jun-1851
I thought that one peculiarity of my “Week” was its hypaethral character, to use an epithet applied to those Egyptian temples which are open to the heavens above, under the ether. I thought that it had little of the atmosphere of the house about it, but might wholly have been written, as in fact it was to a considerable extent, out-of-doors. It was only in a late period in writing it, as it happened, that I used any phrases implying that I lived in a house or lived a domestic life. I trust it does not smell [so much] of the study and library, even of the poet’s attic, as of the fields and woods; that it is a hypaethral or unroofed book, lying open under the ether and permeated by it, open to all weathers, not easy to be kept on a shelf.