<p>Lichens have been growing on this undisturbed stone for decades. The black dots of crustose lichens almost make a picture. What do you see in it?
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Rock covered in yellow and black lichens
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/41585865@N06">Western Arctic National Parklands</a>
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<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/nps_wear/9903539976/">Pointillism</a>