Sabine Hossenfelder just attempted to explain this. Can’t be sure it passes for “eli5”, but you might want to check out the link after you read the thread. She adds a visual dimension to the explanation. I found it helpful. Time crystals are, I guess, a new and unexpected state of matter, which sounds cool.
A theory that time exists in a bubble. A theory that everything that has happened and will happen already happened, and that we live in a snow globe simulation. It posits that time is an illusion. Your experience in this Universe is a never ending rock. You have free will, but you’ve already made your decisions until death.
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