And here's the wikipedia article that this was taken from: <a href="http://en.wikipedia.org/wiki/Tree_shaping" rel="nofollow">http://en.wikipedia.org/wiki/Tree_shaping</a>
I first heard of this from the remarkable gardens of Peter Cooke, which can be seen at their website: <a href="http://www.pooktre.com/" rel="nofollow">http://www.pooktre.com/</a><p>And it also reminds me of the fantastic sci-fi novel by Leo Frankowski, Copernick's Rebellion in which the hero genetically engineers trees to provide housing & food for the globe.
It's an art project but there are upside-down trees at MASS MoCA<p><a href="http://www.massmoca.org/event_details.php?id=29" rel="nofollow">http://www.massmoca.org/event_details.php?id=29</a>