I had originally bought these small acrylic boxes to make cyanotypes. These were sold as display cases for fossils, crystals, coins, etc and came in two sizes: smaller – 20Hx35Wx40L, and larger – 32Hx55Wx80L. Unlike the larger cubes, they are injection moulded rather than assembled from cut pieces and welded. This produces two visible effects – the sides of the boxes are not completely straight, and there is a small mark (the side of the injection moulding) on one of the sides. They also do not have clear bases, so are always open. When I stack these vertically I flip them, so that solid top is against solid top, and open base against open base. This makes for a subtle formal undulation in the stacked “towers”.