Mind is the condition of experience and hence nothing in experience can be beyond mind. Mind in itself is in part absolute and in part extremely fluid and evanescent, in particular the content of experience as experience falls into the latter category. The self-standing world is known through this fleeting medium, so that if it is claimed that all that is is mind there must be another side to mind which ensures the extraordinary self-consistency of the world known through experience. For an idealist there is the unreasonable consistency of physical reality. This can only be due to what must be inferred as a cosmic mind, a demiurge, ishvara or world-soul. This might equally be called god or nature. In this sense materialism and idealism, duality and non-duality are identical.