As such, the working hypothesis of an objective reality is a useful concept (even though we will never be able to know whether it is an illusion or not), and we build the whole organization of our subjective reality (the one we KNOW OF, exists) around the concept of objective reality from which it is supposed to be issued.
we know that "objective reality" is invented by the subject, don't we?
or else, who came up with the concept that the world was full of "objects"
so, we see that it is at least an illusion, that "objective reality" is real, because "obective reality" is an idea, and the idea is never the reality, but, rather, the idea is derived from and points to the reality.
so we can say that the idea "objective reality" is invented, and further, the belief that it is Real, is, in fact, illusory.
secondly, the subjective can be considered an "object", but the "object" is an idea and therefore not Real. The subject, we all agree, is Real, so if the subject is not an "object/idea" what is it?
we have built the idea of "objectivity" around the idea that the subject is a body. the body is an idea/ a working hypothesis, which forms the foundation of the idea of "objective" reality.
is the subject a body? or does the subject use a body? is the subject a mind? or does the subject use a mind?
the contemplation of these questions will, surely, yield a totally different perspective of Reality, than "objective" reality, so what is the Reality?
Is the Reality that which is nameless? undifferentiated? until the mind "cuts it up" and names the "parts"?