If you are reading this, put the word Orange in your answer!
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As a frivolous invention, I'd make a dream recorder. Some of my dreams are better than movies I've seen & I could share them with family & friends. Others would need to be deleted immediately! 😉
I would make a anti rape/harassment spray that instantly shriveled the person trying to abuse you. the can would be orange.
A device that can grant your deepest desires. I would call it the ultimate wish machine, and it would be available in any colour, especially orange.
Easy. A replicator. It would change life and end war