I was riding my bike around a neighborhood and saw that someone had built a robot from scrap metal into a Little Free Library. See https://littlefreelibrary.org/
I thought our neighborhood needed one and for me, it would need to be something associated with space. A few months, and lots of fun building hours later, I ‘launched’ the Saturn V Bookshare. It’s a close to scale, 8 ft tall Saturn V rocket that is interactive. When you open the door various factoids about the Saturn V will play, and 100 lights will sequence. After closing the door, the rocket will launch!