Obviously they are wired in front of a green screen and wires are digitally erased. Then they use sone cgi for the background. 
Georges Méliès balancing three of his own superimposed doppelgängers in 'An Impossible Balancing Feat' (1902)pic.twitter.com/DozkkFzAtH
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Actually, I think they were just on the floor, a green screen would be placed under them. It's quite simple
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Well, this really reduces the production costs. They can hire 10 less computer guys.
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What the hell... how did they do that???? We know they didn’t have a green screen back then...or did they?????
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Ha Ha Badass!
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