Add Collapsible Building to examples of Creative Commons licensed photos

s5/s5-lego_and_open_source.html

@@ -454,6 +454,7 @@ <h2>(continued)</h2>
 <li>Instructions for building a geodesic dome: <a href="https://www.flickr.com/photos/bumcrush/sets/72157624910554769">https://www.flickr.com/photos/bumcrush/sets/72157624910554769</a>
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+<li><a href="https://www.flickr.com/photos/legozilla/">Duane Hess</a> designed a "Collapsible Building" and shared it on Flickr: <a href="https://www.flickr.com/photos/legozilla/sets/72157629083690682/">https://www.flickr.com/photos/legozilla/sets/72157629083690682/</a> (CC BY-NC-SA 2.0) </li>
 <li>Many more LEGO photos on Flickr than we can keep track of are shared under various Creative Commons licenses.</li>
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