Lobed cactus coral (<i>Lobophyllia corymbosa</i>) in Museum of Science, Boston, Massachusetts, USA. Note that there was no prohibition against photography in the museum.
<a href="//commons.wikimedia.org/wiki/User:Daderot" title="User:Daderot">Daderot</a>
<span class="int-own-work" lang="en">Own work</span>