http://conceptrends.com/2008/08/07/simple-cardboard-furniture/ The designer Erdem Selek showed us that plain cardboard can be transform into a simple furniture, like this foldable cardboard stool. The stool is entirely made from a cardboard but for our amazing can carry a person up to 90 kg. No glues and chemicals are used to set up the stool. Smaller versions of this chair can be made to fit in your backpack and take them wherever you go.
This is a simple design that looks very nice with the slots. I believe it would be a great way of organizing calculators, as they will have something to lean on, as well as being separated from each other.
We last looked in on Kobe Design University's "Design Soil" student experiments in when we got a look at Akinori Tagashira's killer flatpack Corker stool. In the years since, KDU's students have continued to produce excellent conceptual work.