Review on Cq Acrylic 15-Inch Clear Invisible Floating Wall Ledge Shelf - Set of 4 | Wall Mounted Nursery Kids Bookshelf, Invisible Spice Rack, 5MM Thick Bathroom Storage Shelves Display Organizer by Mariah Johnson

I like these. We took a set of six 15" shelves and placed them side by side to make three 30" shelves. They're sturdy and while they're 'unobtrusive' compared to traditional bookcases, they hold a lot of books. I hung them low to give my 3 year old access to his collection. He had trouble reaching them on his old wooden bookshelf, and even though it was wall-mounted, I still worried about what might happen if he tried to reach the top shelves. This solved that problem. And the unobtrusive design frees up some space and doesn't overwhelm his small room. The wall anchors that come with these shelves are cheap/fragile and break easily. But if you can stick them in a wall without breaking them, they work fine.