It is impossible to demonstrate the existence of anything apart from evans consciousness, or, in idealistic terms, apart from mind. Many people think idealism has been totally rejected. But if you go to fill ilosophy departments, they are not so sure. The great philosopher, g e Moore, who was an elder contemporary of russell bertrand russell in cambridge,. His refutation of idealism. Apparently, idealism, that the word is in your ivareness, only that idea was totally destroyed by g e moore.