Columbia subject headings:
Identity (Psychology)
Illusion (Philosophy)
Object (Philosophy)
Ontology.
Perfection.
Reality.
Subject (Philosophy)
Harvard subject headings:
Identity (Philosophical concept)
Illusion (Philosophy)
Object (Philosophy)
Ontology.
Perfection
Reality
Subject (Philosophy)
Princeton subject headings:
Illusion (Philosophy)
Object (Philosophy)
Perfection.
Reality.
Subject (Philosophy)