A dog house built out of 1,019 tennis balls was auctioned off to benefit the SPCA of Texas. The Dallas-based architecture and design office CallisonRTKL designed Fetch House with a continuous facade made up of over 1000 tennis balls held by a 3D printed modular support structure. The balls stay in place by compression but can easily be pulled out for a game of fetch with your pooch. When play time is over, the balls can be returned to the walls of the dog house. Genius!