We had a cat who liked to walk on the piano keys at night. I don’t remember why we didn’t just close up the piano, but we didn’t.
I had a cat who would shove his paw down into a bowl of clear marbles that were supporting stems to silk flowers. He would jiggle the marbles around while watching me in bed, to make sure I reacted in typical ‘get out of that bowl’ command. It was the cat’s way of getting my attention for whatever he wanted me to follow him and do, like feed him, change his litter box, or let him outside. The bowl sat on the bedroom dresser across from the foot of the bed. He knew he was not allowed on the bed, so this was his fall back to get his attendants’ attention.