The Poopy Cat Blocks, offered by Dutch cat litter purveyors Poopy Cat, are a series of multiple cardboard modules that can be folded and joined together using reusable cardboard connector pieces. These modular cat playhouses are designed to entertain even the most snobby, high-maintenance feline.
The most basic kit -- the Leopardo DiCatrio kit -- consists of two beams, two cubes, a tunnel, bridge, ramp and two different types of connectors. All of these are made from recycled cardboard that can be painted and customized.
The Poopy Cat Blocks are currently the subject of a Kickstarter campaign. The Leopardo DiCatrio kit can be yours (or your cat's) for a pledge of just $35, with shipping expected to commence in March 2015.