[ToC]

 

Douglas R. Hofstadter, Godel, Escher, Bach: an Eternal Golden Braid, Vintage Books, 1979.

WHAT THIS DIAGRAM SHOWS IS THREE KINDS OF 'IN-NESS'

The gallery is physically in the town ('inclusion'); the town is artistically in  the picture ('depiction'); the picture is mentally in the person ('representation')

Recommended by Andrew K. Peterson