A xylophone meets a pitcher.
Listen to the pitch of the sound made when the pitcher is hit. Compare it with the pitch of the handle (working as a tuning bar) to know if the pitcher is empty or not.
That way you won’t bother to open the lid while having fun.
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Haha! That’s a crazy cool idea!
great stuff man. really great. whatever personal process you have for brainstorming ideas is golden.