pull-out shelves that you can step on to reach the top! Garage shelving idea: the lower shelves actually glide out so you can step to reach top shelved items. Then they slide back to the wall. This would be so easy to DIY!
Note to self: remember this as an idea for cat friendly living room. Add dark rustic floating shelves on the side and create one long platform across the top. Add invisible floating shelves on adjacent walls for more kitty mobility.