The rocket outline of this 47-in cat tower is also its engineering: a triangular structure spreads the load across three points, so the frame stays steady on a 17 by 16-in footprint where a square-post tower would rock. The top perch is ringed by a guardrail, which keeps a sleeping cat from rolling off the highest level. Three large entries lead into the condos, among them a 10 by 8-in arch and a 7.5-in side opening, and the sisal scratching pad detaches once it wears through. Each tier carries 33 lbs.