Messy bikes all over

My neighbor really should get a proper bike rack for his kids. Their bikes are all over the porch, piling up on top of each other. I'm always worried his old parents will trip over those bikes one day. I know he dont have much space in his garage. But he can always get one of those screwless bike racks and keep those bikes up on the wall, on top of another. Apart from being space-saving, they also make the place look neater. And i dont have to worry about those old folks tripping over those bikes one day.