T-Rex: Let's assume that the physical world exists! And let's assume what I'll call "humans" live in this actual for-real physical world.
T-Rex: Let's be CRAZY!!
T-Rex: And let's further assume that these "humans" can interact with this physical world, AND that they can trust their senses reporting on these interactions.
Dromiceiomimus: And to make it interesting, let's assume these "humans" are conscious! Each and every one!
T-Rex: Sure! Why not, right? And let's assume that causality and time are experienced by "humans" as linear, constantly progressing phenomena!
Utahraptor: These are some pretty fantastic assumptions!
T-Rex: I know, right?
T-Rex: But this thought experiment results in "humans" who believe the physical world is real and who interact with it, AND who believe everyone else is conscious and who interact with THEM, but who hilariously can't go back in time to fix even a single mistake. A race both responsible for their actions and wholly unable to change them!
T-Rex: It's a great premise! I might use it as the basis of a book series. And if this turns out to be a bad idea years down the line, I'll just go back and decide not to do this after all!
T-Rex: Hah hah hah!
T-Rex: I LOVE REALITY
