Dave really gets stimulated whenever something is changing. Recently, his cat-tree was being disassembled and reassembled, for reasons unknown to Dave. Dave, always the investigator, ventured forth to see what he could ascertain about the situation. While Dave's investigative skills are superb, he never quite figured out what was going on. Within about 15-20 minutes, the cat-tree had been completely reassembled. The only difference Dave could detect was a slight tilt of the tree that hadn't existed before.
Dave will be continuing his investigation until all the facts are clear.