Hollow Face - Ghost Illusion (Video)

Hollow Face - Optical Illusions by Sir Richard Gregory

Optical Illusions

Will and Guy ponder how Celtic Druids used illusions at times like Halloween to impress and manipulate their worshipers.  We conjecture that witches could also manipulate ghostly images to frighten relatives of the dead.  The effect works because illusions prey on the brain.  Our central nervous system processes images in the present, but gets confused by pictorial memories of the past. 

In modern times, it was Hermann von Helmholtz, who first described illusions as unconscious inferences from sensory data and knowledge derived from an earlier time.  Von Helmholtz's discoveries have been developed by Sir Richard Gregory to create the illusion in the video below.

Stage one of the optical Illusion - The plaster cast.  (See video below)

Stage two - Sir Richard Gregory flips the cast so we see the reverse side

We now see a ghostly picture.

Stage 3 - As the picture / cast turns so the face appears to change its expression

Stage 4 - Sir Richard move the cast slightly and we get a different ghostly illusion

Check out the optical illusion video clip and see how the face changes.

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