If Silberer was skating on thin ice with Freudian orthodoxy with his delicate discussion of the hypnagogic, and perhaps on even thinner ice when exploring the genesis and purpose of symbols, the aforementioned Problems of Mysticism and Its Symbolism (written in 1914, and later renamed Hidden Symbolism of Alchemy and the Occult Arts (2015)) clearly landed him in a pond of apostacy from which he would never emerge.