Let me explain- you do not have to grow up- and I would argue in order to be a great designer you shouldn’t. You need to be able to tap into your inner child in order to create fearlessly. Children have an innate sense of curiosity- and so in order to create fearlessly you have to feed your childhood soul and remember what it meant to be a kid. Question everything, ask why, don’t accept things for face value- oh yeah and be silly and have some fun.