A man awakens inside a white cube, covered in a four-by-four grid. He has no memory of how he got there and there seems no way out. But as time passes, panels open temporarily to admit an intruder or onlooker.
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When I was a child my mother brought me to a Jim Henson film festival. It was mostly his early pre-Sesame Street TV specials. They ended with The Cube. I was terrified, it was the ultimate existential horror. I have never revisited it, but it's ending is seared into my brain. You will never get out of The Cube.