Punctum (n.) is that aspect of a photograph that grabs the emotions and attention of a viewer in a uniquely personal way.
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Punctum (n.) is some (accidental) detail of a photograph from which a viewer cannot turn away.
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Punctum (n.) is what breaks through the field of liking and wounds, leaving emotion and concern in place of approval.
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Punctum (n.) is a rift in the continuum of information, a place of density that has no name; the incapacity to name it is the symptom.
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Punctum (n.) opens only to a gaze that lingers, and often comes late, in memory, after the picture is gone.