How hard to realize that every camp of men or beast has this glorious
starry firmament for a roof! In such places standing alone on the
mountain-top it is easy to realize that whatever special nests we make -
leaves and moss like the marmots and birds, or tents or piled stone - we
all dwell in a house of one room - the world with the firmament for its
roof - and are sailing the celestial spaces without leaving any track.
-- John Muir, American Naturalist (1838-1914)