So, we built the cat something to play on.
We started by stapling some carpet onto a piece of 3/4″ plywood.
Then we stapled some rope around a 4×4 beam
The tubes are those heavy duty cardboard ones designed for making cement footings…. we stapled an old towel to it.
Here it is all put together. The top part is a tube cut lengthwise to make a small bed.