Little potholes (blowholes) on a concrete surface
<a href="//commons.wikimedia.org/w/index.php?title=User:Elgewen&amp;action=edit&amp;redlink=1" class="new" title="User:Elgewen (page does not exist)">Elgewen</a>
2010-12-24
<span class="int-own-work" lang="en">Own work</span>