Columbia subject headings:
Art, Modern--21st century--Exhibitions.
Art--Italy--Milan--Exhibitions.
Doors in art--Exhibitions.
Harvard subject headings:
Art, Modern--21st century--Exhibitions
Art--Italy--Milan--Exhibitions.
Doors in art--Exhibitions.
Princeton subject headings:
Art, Modern--21st century--Exhibitions.
Art--Italy--Milan--Exhibitions.
Doors in art--Exhibitions.