Heinrich Klüver's four types of form constants, geometric patterns which are recurringly observed during hypnagogia, hallucinations and altered states of consciousness.
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“Just Let Go Completely,” a 2007 Cannabis and Ketamine experience report by SkiBum for the Erowid Center.
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“Hollow,” a 2017 Ketamine experience report by stockholmbaby for the Erowid Center
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“Going WAY Down The Rabbit K-Hole,” a 2016 Ketamine experience report by Celestial for the Erowid Center.
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“What Does It Feel Like to Die?,” a 2010 Ketamine experience report by WordsofTruth for the Erowid Center.
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“So That’s What Death Feels Like,” a 2010 Ketamine experience report by Double D for the Erowid Center.
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“Conceptual Apocalypse,” a 2018 Ketamine and Cannabis experience report by Regis L for the Erowid Center.
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“Conceptual Apocalypse,” a 2018 Ketamine and Cannabis experience report by Regis L for the Erowid Center.
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“The Most Intense Nothingness,” 2001 heroin experience report by Silver for the Erowid Center.
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“Generation Adderall,” article for the New York Times by Casey Schwartz, linked in the amphetamines vault of the Erowid Center
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“A Walk With the Universe," a 2020 2C-P and amphetamines experience report by Fairy Princess for the Erowid Center.
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“Riding Her Voice," a 2007 LSD, DMT, and Cannabis experience report by Elevation for the Erowid Center.
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“Riding Her Voice," a 2007 LSD, DMT, and Cannabis experience report by Elevation for the Erowid Center.
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Reddit reply to an r/psychonauts thread by user logicalmaniak
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The Archaic Revival - Terence McKenna
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“A Devotion,” 2006 Heroin experience report by Seven for the Erowid Center
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“Starry Night," 2022 Mushrooms, Alcohol, and Cannabis experience report by mundane for the Erowid Center
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