Bulli, Quine

http://www.acooke.org/jara/bulli/
Bulli is a toolkit for making your own "Parquet Deformations" a la Escher.

http://www.excessus.demon.co.uk/misc-hacks/#quine
A quine is a program which prints its own source code. Quine is a kit
for turning any C program into a quine (as well as preserving its
original functionality).
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