Nicely explained like how Carl Sagan did but there used to be a lot cooler YT channel which exposed the secrets of tesseract, number 8, 88, connected to CERN, shown the blueprints of a machine that becomes a portal to the planet Saturn. Lot of conspiracy theories back in the day long before tesseract was made famous by Marvel movies ignoring comic readers. Ultimately his channel got deleted, always wondered what happened to the guy.
Anyway, the guy in the video got one thing accurate - time isn’t objective, mind creates space, time and causation as per Vedanta which Immanuel Kant put forth the idea as well. I was buried deep in researching tesseract, saved lot of material but my old hard drives are now useless. I remember one gif which shows tesseract when opened becomes a cross and many strange weird gifs using tesseract.
If you meditate on the gif shown in the video or a better version of it where it moves in and out after a while you will get an inkling space could be really an illusion.