Contrapuntal Themes
in a Shadowland
 
(See previous entry.)

Douglas Hofstadter on his magnum opus:

"… I realized that to me, Gödel and Escher and Bach were only shadows cast in different directions by some central solid essence. I tried to reconstruct the central object, and came up with this book."

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Hofstadter's cover

Here are three patterns,
"shadows" of a sort,
derived from a different
"central object":

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For details, see
Solomon's Cube.

Related material:
The reference to a
"permutation fugue"
(pdf) in an article on
Gödel, Escher, Bach.