I suppose its a bit circular to say that not real things are not real. But we talk about them, consider them, and comprehend them, often times just as easily as we comprehend any real thing,
But since we cannot find them in reality, we must say they exist in the mind somehow.
How odd it is to say anything is not real at all, but seeing as how such things exist in the mind, we can at least rightly say, that what’s not real must somehow be the domain of the mind, seeing as how we cannot find it anywhere in nature.
But if we look closely, the mind handles everything real in first in terms of what is not real. The body translates physical forces first into something not real for the mind. A force reaches the mind as a sensation, not as a force.
So that if we look at the mind’s contribution to reality, it is in adding that which is not real to it for what is real already exists without it.
So that which is exclusively real is less than the mind in some fashion, for it seems to get by just fine without the mind at all.
Rocks don’t need minds to be rocks, but we can’t seem to get along without them.