People have known about the psychoactive effects of certain plants, animal poisons and fungi for centuries and, in some societies, these psychedelics have been revered and even used as a part of worship and ritual. That said, it was not until LSD was discovered by a Swiss chemist in 1938, apparently by accident, that the power of very strong psychoactive stimulants began to be known about. With such strong 'trips' now possible, psychedelics moved away from the often mysterious spiritual or religious contexts they had hitherto been associated with and into the realm of altered consciousness. This made them of interest to some psychoanalysts who thought they might help with addressing subconscious issues.