Kant gives three arguments by which he tries to prove that space is not a concept we get by observing objects outside of us, but is, instead, a single unified system that we must have in our minds...

Kant gives three arguments by which he tries to prove that space is not a concept we get by observing objects outside of us, but is, instead, a single unified system that we must have in our minds even before we observe any objects outside of us. Can you summarize those three arguments in your own words? Do you think those arguments are right? Why?