Uncanny valley

Repliee Q2 gynoid; source: https://upload.wikimedia.org/wikipedia/commons/a/aa/Repliee_Q2.jpg "Das Unheimliche" von Siegmund Freud (1919) and E.T.A. Hoffmann's "Sandmann" (1816) WIKI :: The concept of the uncanny valley suggests humanoid objects which appear almost, but not exactly, like real human beings elicit uncanny, or strangely familiar, feelings of eeriness and revulsion in observers.