Most of us got into programming out of love for building neat stuff, but there's a satisfaction to creating physical products with your hands that programming can't satisfy. Programming is like building structures out of Lego, but you don't get to play with a toy spaceship at the end. Out of nostalgic desire to return to the days of our misspent youth, at the last Airbnb hackathon a group of engineers worked on a project that combines the two: a web application for building with Lego.