ceiling furniture means doesnt take up space on the floor, but then maybe you need high ceiling for it. plus not all owners will want cats jumping on them from up high and like OMG! get some yourself some pawtastic adorable cat apparel!
(Also brings up the question about cats deciding to hack up a hairball from above.
Kitty habitat for the front window.
If you& a cat lover, you should try these DIY projects ASAP.