Split screen (video production) in the Russian silent film "The Queen of Spades" (1916), directed by Yakov Protazanov, where one screen depicts reality and the other a character's inner desires. This technique has been used to portray twins in such films as "Wonder Man" (1945), "The Dark Mirror" (1946), "The Parent Trap" (both the 1961 original and the 1998 remake), and "Adaptation" (2002). In the 1961 version of "The Parent Trap", conversations between the twins were simulated by filming the actress (Hayley Mills) as she stood at the left of the frame facing right, then filming her again, standing at the right and facing
The Parent Trap (1961 film) twins dress and talk alike so their parents are unable to tell them apart. They will reveal who is who only after returning from the annual family camping trip. Mitch and Maggie reluctantly agree. Vicky is furious, so Maggie tricks her into taking her place and letting her know it would give her a chance to get to know the twins better. Mitch is an outdoorsman, but Vicky is not, and she is not used to climbing mountains and being in the woods, so the twins decide to play tricks on her. Vicky spends her time swatting mosquitoes after unknowingly