In the 1989 Indian film, Apporva sagothargal actor kamal hassan plays a double role - one of a normal man and another one of a dwarf. How was kamal Hassan displayed as a dwarf in the movie ?
A number of techniques were involved for the portrayal of a normal man as a dwarf on the screen. For some shots the actor folded hi legs from feet to knees. For some static scenes his legs were hidden inside a trench. Special shoes had to be used when the character was shown walking. The movie's director has explained it all here.