Visibility

Definition and stakes

John F. Morrison,  Training Infantry (1914)

“ The men should be taken out and taught to orient themselves by the stars and prominent features that can be distinguished at night. The effects of different backgrounds on the visibility of objects should be demonstrated, and especially the prominence of objects on a skyline. ”
Source: Gutenberg

Portrait of Edwin Abbott Abbott Edwin Abbott Abbott,  Flatland (1963)

“ I for my part noticed by the sense of sight, before I entered your Kingdom, that some of your people are Lines and others Points, and that some of the Lines are larger———” “You speak of an impossibility,” interrupted the King; “you must have seen a vision; for to detect the difference between a Line and a Point by the sense of sight is, as every one knows, in the nature of things, impossible; but it can be detected by the sense of hearing, and by the same means my shape can be exactly ascertained. ”
Source: Wikisource

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