“GNU's Not Unix” curves above, and “Free Software Foundation” borders below in this Lisp-like statement about GNU. Two “parentheses” formed by curved, dancing GNUs form a pseudo-Lisp program: (USE 'GNU).

The dancing GNU parentheses were drawn by Etienne Suvasa; they are part of the cover art for the GNU Emacs Lisp Reference manual. The rest was designed by the FSF staff for the 1996 GNU t-shirt.

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