Quantum mysticism in the sense of consciousness playing a role in quantum theory first appeared in Germany during the 1920s when some of the leading quantum physicists, such as Erwin Schrödinger, leaned toward such interpretations of their theories. Others, such as Albert Einstein and Max Planck, objected to these interpretations. Despite the accusation of mysticism from Einstein, Niels Bohr denied the charge, attributing it to misunderstandings.