Ever dreamed of typing on thin air? With projection keyboards, it's possible! Just connect it to your phone and type on a holographic keyboard—say goodbye to coffee spills on your keys. Love the beach but hate the mess? Meet the sand-proof beach mat. Lay it down, and sand that lands on top magically disappears through the mat, leaving you with a mess-free beach day. And for your shopping convenience, imagine a cart escalator in every store. Push your cart into a slot, and it travels alongside you at the same speed as the people escalator. Which of these genius inventions would you want in your city first? Comment your pick below!

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