The Silence of the Lambs Optical Illusion is based on the origin of the skull on the moth of the cover. The Death’s Head Moth features a skull over its head, but the skull is not an actual Skull. The Skull was originally the Dali Portrait which features nude women arranged in such a way to make the outline of a skull.
Manny did not notice this til much after the the movie was released, if you still haven’t seen it.. check it out! this illusion is very fitting for the movie. Also check out the newest recreation of the Dali skull in The Decent Movie Cover.