A long time ago, I came across something called Savage Chickens. The guy draws cartoons on sticky notes. Usually the cartoon is one panel, on one 3x5 note. Sometimes he will combine multiple notes.
This might well be the ultimate cat tree, taking up five sticky notes. Enjoy.
The original post is here, if you want to check it out. Supposedly, there are 22 cats playing on this tree.
As always, click on the image for a larger version.
PS: For some reason, Blogger's 'larger' version is still only about half the size of the full blown image from Savage Chickens. FWIW.