Columbia subject headings:
Anamorphosis (Visual perception)--Congresses.
Art--Philosophy--Congresses.
Form perception--Congresses.
Optical illusions in art--Congresses.
Picture interpretation--Congresses.
Visual perception--Congresses.
Harvard subject headings:
Anamorphosis (Visual perception)--Congresses.
Art--Philosophy--Congresses
Form perception--Congresses.
Optical illusions in art--Congresses.
Picture interpretation--Congresses.
Visual perception--Congresses
Princeton subject headings: