Mystery Item is the 111th puzzle from The Curious Village.
One of the four shapes below has one less match than the rest of them. While studying these four small shapes, your friend approaches you with a riddle. "I'm thinking of something that is necessary for human life. It appears in just about every house you've ever visited and decreases in amount gradually the longer it is around. What am I thinking of?" Move one match in the picture to form your answer to your friend's puzzle.