<http://schema.org/about>
"For all of you who think that your homes are too small or too cluttered for tabletop games, we present the Ping Pong Door. That's right -- it's a functioning door, and when a game of table tennis calls your name, an inner panel folds out of the door;"^^<http://www.w3.org/2001/XMLSchema#string>
<http://www.treehugger.com/sustainable-product-design/ping-pong-door-opening-the-door-to-space-efficient-table-tennis.html>