What is really real?

According to some, a fundemental question. Pragmatism and positivism would answer thusly: "it depends on how you define 'real.'" It really makes the question rather unimpressive.
For those who like word games, however, it's deeper than that triviality. Does the universe exist as matter, which I am able to perceive? Or is it rather my perceptions that are simply creations of my thought? Or are they really God's thoughts, that exist outside of the material realm?

To ask this question is to bring your reality tumbling down.

If you question reality, then how can you stand? (logically speaking)

It's like trying to build a skyscraper by dynamiting the foundation. You can't get anywhere, because by questioning reality, you question yourself (you being a part of reality), and by questioning yourself, you bring your logic, and therefore, your original question, into question. So on and so on, ad infinitum, ad nauseum.

You just have to accept it, for now, until you get some evidence that you aren't a part of reality.