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Alright alright alright<It was at this point that he remembered that be never understood the bookshelf scene from Interstellar>
So…. And it’s mentioned in movie… there is a theory that gravity (or gravity as we know it being its physical manifestation) is the next dimension in our physical universe. As we perceive it, under this theory, gravity passes unobstructed through space-time, meaning that gravity as an individual physical force exists at all points in the timeline pre and post what we perceive as a gravity inducing object (black hole, sun, planet, etc) even actually existing.
In the movie, future humans learn how to enter and exit the gravity stream. However in a bit of chicken/egg conundrum, they require Cooper to transmit the required data to Murphy. Landing within the tesseract within the black hole, he is able to manipulate the gravitational effect along that gravitational objects timeline thus transmitting information to the past (although it’s not interpreted until the present).
In an emotional gut punch, the theoretical gravity also exists metaphysically and metaphorically between Cooper and Murphy (which allows him to perceive her “past” in order to transfer the data) and then at the end of the movie it also exists between him and the smoking hot Anne Hathaway.
In terms of the confusing portrayal of a tesseract (the folding in/collapsing of images) that is because we can not physically comprehend what an observational viewpoint of the entirety of the space-time continuum would look like to our understanding of reality.