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He grew interested in philosophical mysticism and universalism , addressing these subjects with works such as " The Perennial Philosophy " ( 1945 ) - which illustrates commonalities between Western and Eastern mysticism - and " The Doors of Perception " ( 1954 ) - which interprets his own psychedelic experience with mescaline .
 None
Given options, please tell me the categories of all the listed entity words.Output format is "type1: word1; type2: word2". 
Option: location, person, organization 
Text: {0} 
 Entities:  
Answer:
 None