Director Matt Wolf said he was inspired to make his new documentary, “Spaceship Earth,” after seeing photographs of Linda Leigh and Mark Nelson in bright red jumpsuits in front of the massive early-1990s science experiment known as Biosphere 2.

“I was just doing research online and I saw these very compelling images of eight people including these two (Leigh and Nelson) in bright red jumpsuits in front of this enormous glass pyramid and I actually thought it was still from science fiction film and when I realized it was real,” Wolf told TheWrap’s Steve Pond at the Sundance Film Festival.

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