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Robert Redford was bowled over — literally — by a virtual reality film at Sundance.

The fest’s founder was spotted at a screening of the artfully trippy film, “Spheres: Songs of Spacetime,” created by Eliza McNitt with Darren Aronofsky and others, when Redford was “so overwhelmed by the virtual reality experience … he stumbled midway through,” a spy told us.

Luckily, “the spry 81-year-old immediately got back up and continued.”

Either way, he later “left covered in sweat!”

Oculus Rift will release the film about the “songs of the cosmos” narrated by Jessica Chastain and exec produced by Aronofsky.

Sundance’s VR Experiences section also includes projects created with will.i.am, Rosario Dawson, Megan Ellison and Maria Bello.