the.com/projection

Accusing the mirror of having your face.

means Attributing your own unacceptable feelings, motives, or flaws to someone else, so the problem seems to live out there instead of in you.

from From Latin proicere — 'to throw forward' (pro- 'forward' + iacere 'to throw'), the same root that gives us 'project' a film onto a screen. Psychoanalysts in the early 1900s borrowed that image exactly: the mind casts its own unwanted material outward, like a projector throwing a picture onto a wall, so it can be seen and judged as if it belonged to someone else entirely.

Freud's daughter
Anna Freud catalogued it among the classic ego defenses
cheaters' tell
studies link infidelity suspicion to one's own cheating likelihood
playground version
takes one to know one is basically the folk theory
modern slang drift
now used loosely for any hypocritical accusation online
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