A snail that was sprayed over with green graffiti a long time ago. The green paint remained on the shell as new shell grew, leaving a green spiral in the center.
<a href="//commons.wikimedia.org/w/index.php?title=User:Frdp&amp;action=edit&amp;redlink=1" class="new" title="User:Frdp (page does not exist)">Frederick Depuydt</a>
<span class="int-own-work" lang="en">Own work</span>