Astronomers sometimes use this phrase to describe skies that are most clear for their work. The atmosphere doesn't obscure the view and accurate observations may be made.
One can explore pages of a book that draws their attention, in this instance using the same tools as those employed in previous examples. Subjectivity influences how they are used, what adjustments are made. The data is really in the page though, and in that fact, a certain objectivity exists.
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