Here is interesting read.
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Not an Illusion but the Nikon small worlds videos are great
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(from within the link above)
Forced perspective
Forced perspective relies on an optical illusion to make objects appear closer, farther, larger or smaller than they actually are. For instance, in film, in the final scene of Casablanca the escape airplane was actually a miniature, flat cutout whereas the extras working on the craft were little people, which helped create the illusion of size. Modern film versions of forced perspective include giant Hagrid in the Harry Potter movies and the dwarves and hobbits in the Lord of the Rings trilogy. “Forced perspective works because the 3-D vision system in humans is crap,” Macknik says. “We use a flat retina, a 2-D ‘device,’ to see in 3-D and therefore must rely on perspective clues to determine size and distance.”
In sculpture, classic examples of forced perspective include Michelangelo’s David and the Statue of Liberty where the illusion helps make their proportions seem more natural when viewed from below. Forced perspective is also used in amusement parks such as for Cinderella’s Castle at Walt Disney World and the new Hogwarts Castle at Universal Studios to make those structures appear more impressive.
This is one reason why i suggested monoscopic rendering on Pimax. Forced perspective is a great way to convey depth cues.
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