| http://www.w3.org/ns/prov#value | - He bases his work mainly on the meaning of symbols, pictograms and language, which he uses in his own cosmological system arranged in five levels: 'physical elements' (pure matter), 'world unframed' (the world created by man, the world of things), 'world framed' (the sciences, the arts), 'language' (symbols and language) and 'subjective meaning' (mental activity).
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