Have a messy room? Here's a tool you can build to clean it in an instant

Colin Furze's debut book, This Book Isn't Safe features ten inventions kids can make at home with step by step instructions. Inventions include "Concrete-Crusher Boots," the "Fab Frisbee Flinger," and the "Downhill Racer." Below, Colin's instructions for making the Brilliant Bedroom-Tidy Pulley: