<p>Natural and man-made structures, contrasted.
</p>
Hollyhocks in the foreground with Canary Wharf behind.<br>structures
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/21372046@N00">Andy Roberts</a> from East London, England
CC BY 2.0
<a rel="nofollow" class="external text" href="https://www.flickr.com/photos/21372046@N00/3687643">Flickr</a>