Very smooth, tight joints on crazy paving at Walden Pond beach.
<a rel="nofollow" class="external text" href="https://www.flickr.com/people/48094458@N00">Josh Graciano</a> from Concord NH, USA
CC BY-SA 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/newmundane/6668455123/">Nice Paving</a>