Here's a model of the device created in Rhino.

Design an Interspecies Technology
Neutered cats get bored and fat without entertainment. But each cat has his own personality and therefore is entertained by different activities. I propose a cat entertainment center with a variety of technologically-based and non-technologically-based activitities to appeal to a variety of discerning sentient feline beings.

This central cylinder is a PVC pipe wrapped in rope for comfortable climbing and scratching. The platforms are simply cut, painted plyboard. The top platform is for the adventurer cat who likes to climb high and sit and watch the world.

The second platform has a box on it with a plush mouse toy in it. But this is no ordinary plush mouse toy. It has a motion sensor in it and whenever a cat tries to reach it and snatch it, it will run in the opposite direction.

This cat is so happy to be playing in his new cat entertainment center that he hangs with a mouse.

The two dangling, plush toys, one fuzzy and one feathered, hanging from middle platform first appear to be complete unenhanced, electronically. But actually each toy has in it an accelerometer. After two minutes of play, a small box on the bottom of the middle platform releases a small quantity of catnip.

The final element of the cat entertainment center is the cuddle box at the bottom of the pole. The cuddle box is a climated controlled, vibrating box filled with soft material. When a cat enters the cuddle box a pressure sensor notes its presence and the material swells to cuddle the cat on all sides and vibrates slightly. A temperature gauge keeps track of the temperature of the outside air and heats or cools the soft material to maintain a constant 75 degrees.