Line of sight

Definition and stakes

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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