There is something. All that there is, we generally call "reality". Note that by this definition, reality is unique.
This is a very useful model, but only a model. If anything, it requires an extra assumption compared to the straightforward instrumentalism, thus violating the spirit of the Occam's razor.
That's little more than tautologies here.
To quote EY, belief feels like truth from the inside. Have you rationally examined your belief in reality?
Reason without a starting point forms a very, very small closed loop with nothing interesting inside. "Cognito ergo sum" is about the extent of it. In order to do anything interesting, you need to assume that you can rely on your senses at least a little bit, and there's not really very much you can do to examine that belief.
From Being a Realist (even if you believe in God):
My mother, who doesn't call herself a theist (I think she's agnostic), doesn't even accept realism. She doesn't even agree with this:
That's little more than tautologies here. Yet it elicited an impression of being forced to believe. I know because she told me about the totalitarian dangers from such narrow thinking.
I'm happy to have finally found the root cause of our ongoing disagreement, but now, how can I deal with that? It looks pretty hopeless, but just in case, does someone have a suggestion, or should I just leave it at that? (My ego doesn't like it, but giving up is an option.)
Now I'm relieved to know that in near mode, she's a complete realist. This craziness only shows up in far mode.