There’s nothing my dogs like more than tennis balls, which is why I think this house by CallisonRTKL is so cool. CallisonRTKL used two 3D printers and 1,019 tennis balls to create this dog house in order to auction it off for the SPCA of Texas, an animal care center. The tennis balls are kept on the house with the support of a modular structure. What’s even cooler is that the balls can be pulled off the house for a fun game of fetch with your pup. Then the balls can be reattached because the CallisonRTKL designed them to stay in place with compression.
Check it out: