A Skyway for indoor cats
 

Speaking of "artificial and fabricated toys & equipment"...

As I've said before, my indoor cats have a "Skyway". It's mostly made of
1x4s, 2x4s, and a few very wide boards. It's overhead, just above head
level. Had it for years now and they still use it all the time. It has
two ramps as access ways, a in different locations. A good thing about a
Skyway is that it gives your indoor cats a place to be other than
underfoot. And they appreciate it. It provides some exercise and also
allows an escape route from an aggressive newcomer.