Buddhism says: all things are illusory and noting exists. However, Advith avers that it is not so. It says that the universe of course is illusory, but there is Brahman, that exists forming the very substratum of all things.
The doubts rise in seeking mind:
How could the waking to be illusory?
One is aware of so many things happening within the waking so could it be illusory?
They raise this question taking that illusion to be something to very real. It is the phenomenal appearance of the world observed from the standpoint of the ego ,which is the false self within the false experience , and not from that of the soul or consciousness , which is the innermost self.