Dice are impressively strong. From three sets I made a bookshelf that is six cubes high and six cubes wide with metal or plastic supports that won't bend or kink. The plastic sheet that the books lie on warps a little, but not enough to see without removing the books and looking at the sheet - in other words, not enough to see from the front when looking directly looks at it. That slight stretch is all that's going on, even in cubes filled with large, dense textbooks. It's not as pretty as a wooden bookcase, but it's lightweight, durable, and affordable. I would advise buyers to use the included hammer to ensure the squares are fully pressed against the plastic connectors and plastic supports. This saves you trying to score them with your hand. When the squares are fully connected, the bookcase has clean, straight lines and doesn't look flimsy or cheap.
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