Interesting if not terribly useful. The idea of using vertical space to increase your cat‘s territory is awesome! But nothing here works for those who live fairly transitory lives (I‘m in my fourth house in 6 years, possibly moving again in 2-5 years) and that‘s frustrating. Also, how to use that space while keeping some areas off-limits (mantle where the TV is, corner where the Christmas tree will be)? Some good points though, food for thought.