We recently installed new shelves, but with all the books taken out of storage, we were still having trouble with space. We had mass-market paperbacks stacked either two-deep or rows on top of each other. Either way, not the best. I had saved a pin showing lifts for a DVD shelf, but didn’t like way it was set up. The pin image shows a closed, fixed-width cube-shelf, but our shelves are open and I needed a more fluid, adjustable system that I could add or move chunks for future book accumulation. Then we made a random trip to the dollar store one day, and found the solution.