Corner box shelf. This would take up way less space than a bulky bookshelf!
John Green 45 oak hook. Hooks slide along in this simple yet practical design.
Handmade 5ft oak Bookshelf with a twist by WoodCurve. Pretty Cool
Ana White | Build a Modern Slat Top Outdoor Wood Bench | Free and Easy DIY Project and Furniture Plans
3 way joints - 6 ways to make corners
Cool Corner Joint.