A cat tree tower, also known as a kitty condo, cat tree house, or cat tower, is a piece of pet furniture which provides a place for play, exercise, and sleep for pet cats. Consisting of vertical and horizontal elements, a cat tree tower provides cats with claimable territory. In a multi-cat household, a cat tree tower helps to provide harmony by allowing different cats to claim space in the vertical structure, as cats rely on vertical forms for safety, comfort, and fun. Cat tree towers vary in structure, but cat tree towers that are higher with more opportunities for perching are more popular with cats for allowing better opportunities to survey their surroundings.