Orange cup coral (<a href="https://en.wikipedia.org/wiki/Balanophyllia_elegans" class="extiw" title="en:Balanophyllia elegans"><i>Balanophyllia elegans</i></a>) at 
the <a href="https://en.wikipedia.org/wiki/Monterey_Bay_Aquarium" class="extiw" title="en:Monterey Bay Aquarium">Monterey Bay Aquarium</a>
<a href="//commons.wikimedia.org/wiki/User:Tewy" title="User:Tewy">Tewy</a>
CC BY 2.5
<span class="int-own-work" lang="en">Own work</span>