Devil's Marbles, a boulder cracked by weathering, cf. <a rel="nofollow" class="external text" href="https://www.flickr.com/photos/princeroy/2079228659/">explanation</a>. Australia.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/princeroy/">Prince Roy</a>, Taipei
CC BY 2.0
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