Spoiler alert. One of the most jaw-dropping moments of Christopher Nolan’s 2014 film Interstellar is the climactic moment when Cooper (Matthew McConaughey) enters a visually stunning environment that allows him to physically communicate through time using gravity. In the movie, the scene is manifested as a small library in his home that appears to infinitely repeat with versions of every moment that has ever occurred there. Essentially it’s a cube in four dimensions. Here’s a pretty good explanation of how it works: The Tesseract is a means of communication for the bulk beings to express action through gravity with NASA. More
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