Like shipping pallets, wooden cable spools are another item that is usually found for free on Craigslist. Since cable spools are limited by their shape there are fewer repurposing options, but they make a great coffee table bookcase.
Teds Woodworking - French designer Alexandre Pain created Rossignol, a custom designed wood shelf and railing system that can be used to store books and act as a guard rail for the staircase. - Projects You Can Start Building Today
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Sarah Richardson, Design Inc - idea of what to do with nook in room. Floating shelves - chalkboard paint squares for note taking on side walls. Table legs are more for decor than function. Very into the maze like setup of shelves.
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Kitchen or anywhere DIY. Seems simple enough, depending on your gap between shelves, anywhere from ropes to ropes for your spacing. You could even use wider wood, just adjust your rope length to accommodate your width and height of your shelves.