Oculus, interior of the Roman Pantheon
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/9996363@N08">Sarahhoa</a>
CC BY-SA 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/picktoframe/28358825173/">P8040044 Rom</a>