What a cat CAN do and what you can MAKE them do are two entirely different things! 
BTW, so twice now the top attachment that covers the blinds assembly (whatever those are called) had fallen on the floor. I put it back on, and it seems very secure, I just couldn't figure it out.
Finally yesterday I saw Wesley on my top bedroom window, which is over 8 feet off the ground!!! Found out he jumps onto the bed, then onto the narrow backboard, then up and over in a tremendous leap up to that ledge. But he can't get down the same way he gets up, so he perches his front feet on the cover that keeps falling off to make the jump down to the carpet softer and it apparently doesn't bear his weight sometimes! Annoying but IMPRESSIVE, as I had no idea cats could jump that far!!! 