Diamond signs

Fotos of signs come from the website of Donald E. Knuth: http://www-cs-faculty.stanford.edu/~knuth/diamondsigns/diam.html.

All fotos were taken by the family of Jill and Donald Knuth and are their property.
The following are my favourite:

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Copyright (©) 2005 - 2012 Michał Skrzypczak

last modification: 15:12 23.02.2012