From StarTalk.

In this interview, Neil deGrasse Tyson and theoretical physicist Kip Thorne discuss a key scene from Interstellar where the protagonist, Cooper, enters a black hole and finds himself inside a tesseract—a four-dimensional construct created by an advanced civilization. This allows Cooper to experience time as a physical dimension and communicate with his daughter across timelines by pushing books through a bookshelf. Thorne elaborates on the real scientific concepts behind the scene, including how he and director Christopher Nolan debated the feasibility of faster-than-light travel and ultimately settled on a scientifically grounded method involving higher-dimensional space.

From ‘The Science of Interstellar with Science Advisor, Kip Thorne’: https://youtu.be/4f9V-8BHONo?si=agBC1vyFNttlID92

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