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English Language & Usage

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    The "hard" is in contrast to shadows, which are soft edged, and can merge. Commented Mar 6, 2012 at 13:41
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    @Schr: make that comment an answer. Commented Mar 6, 2012 at 14:04
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    I'd say "only" here means more like "except", but same idea. Commented Mar 6, 2012 at 15:04
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    I took it to mean "hard" as in hard-edge, not hard as in solid. A hard edge is a very distinct edge, as opposed to a soft-edge, which is blurry/fuzzy, like shadows often are (though shadows can be hard as well). The occupants of Flatland have hard edges, as you'd expect. Commented Mar 6, 2012 at 18:44