Look!: Tube Shelving

Check out this shelving system — it's made from cardboard forms for concrete tubing. Instructables user nagutron had set the tubing aside to make speakers, but we think these shelves are a great looking, practical application of the material.
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Nagutron made flat surfaces within the tubes out of books, but one could just as easily make the bases out of plywood, sheet metal or glass.
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See the entire slideshow here.