P3D Re: Hollow Face Illusion

["Xal razutis" <razutis@xxxxxxxxxxx>]

It would be interesting to know where the first examples of the 'hollow 
face' illusion came from, and in which century, and  presumably in a 
sculpted form.

Anyone who has visited the Haunted House at Disneyland (Calif.) has seen it 
at the entrance of the attraction.  Some have mistaken them for 'holograms'.

Holographic 3D displays have for years featured a variation on this when 
presenting a 'pseudoscopic' (inverted in depth) version of a concave 
face-mold. In other words a hologram is made of a face-mold (the orthoscopic 
image), then copied to invert the image (inside-out) and project the new 
image out in front of the plate.  The new image appears to follow the 
viewer.

These illusions have as much to do with the mind's desire to reorganize a 
'strange' visual experience into one that is 'normal' to cognative 
functions.  (We expect objects - especially faces - to be convex to the 
viewer).

Another source for this illusion, one without added lighting, is available 
from Hi-Q Products (Calif.) - the 'Illusion of Vincent' and posted at

http://www.yot.com

Al Razutis

Visual Alchemy
razutis@xxxxxxxxxxx
razutis@xxxxxxxxxxxxxxx
web: http://www.alchemists.com/
film-3D-video-holography-VRML

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