To have entropy, you need to have a notion of information. To have information, you have to decide which differences matter, I.e. which states you classify as t

To have entropy, you need to have a notion of information. To have information, you have to decide which differences matter, I.e. which states you classify as the same. This isn't a problem for physics, or for computer science. But it is a problem for would-be philosophers (including a few physicists and computer scientists!) who thought information was a shortcut to avoid answering big questions about what matters, what we care about.