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A new technique developed for The Lord of the Rings: The Fellowship of the Ring was an enhancement of this principle which could be used in moving shots.
Portions of sets were mounted on movable platforms which would move precisely according to the movement of the camera, so that the optical illusion would be preserved at all times for the duration of the shot.
The same techniques were used in the Harry Potter movies to make the character Hagrid look like a giant.
Props around Harry and his friends are of normal size, while seemingly identical props placed around Hagrid are in fact smaller.

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