$ wget http://chris-lamb.co.uk/site_media/lambigram.png
$ convert lambigram.png \
   -delay 5 -gravity center -compose Src-over -background white -dispose previous \
   $(for X in $(seq 0 10 180); do echo \( -clone 0 -rotate $X \); done) \
   -extent 90x90 out.gif
$ sensible-browser out.gif
/wp-content/2009/lambigram_anim.gif