Playing table tennis outdoors is preferable to an indoor setting, but typical indoor composite setups don't stand up so well to the elements of nature. Enter Henge Concrete Table Tennis Platforms ($3,500). Made up of three pieces of sculpture-like reinforced concrete, these sturdy surfaces bounce more or less just like their indoor counterparts, conform to International Table Tennis Federation specifications, and include nifty powder-coated steel nets that should make for some very interesting deflections. [Thanks, Tim]