xkcd: A webcomic of romance,
sarcasm, math, and language.
Warning: this comic occasionally contains strong language (which may be unsuitable for children), unusual humor (which may be unsuitable for adults), and advanced mathematics (which may be unsuitable for liberal-arts majors).
present company excepted, of course :)
there have been many! — true story!
some of these guys look pretty cheerful, given the disposition of their heads…
this is one of about 400,000 photographs recently released into the public domain for non-commercial use by the metropolitan museum of art. this one and the others can be found at