The shell of <i><a href="https://en.wikipedia.org/wiki/Epitonium_scalare" class="extiw" title="w:Epitonium scalare">Epitonium scalare</a></i>
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/jurvetson/">Steve Jurvetson</a>
CC BY 2.0
Image <a rel="nofollow" class="external text" href="https://www.flickr.com/photos/jurvetson/2490285058/">Artistic Wormhole</a> from Flickr by <a rel="nofollow" class="external text" href="https://www.flickr.com/photos/jurvetson/">jurvetson</a>. Cropped 4:3 by <a href="//commons.wikimedia.org/wiki/User:Snek01" title="User:Snek01">User:Snek01</a>.