The Gridded Shelf, by Hayo Gebauer, is a shelving unit designed to hold your things in order. Each shelf has different sized perforations that go from large to small, which in turn, affects how you place your things on it.
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The shelves are made from 3mm steel plates that are each laser cut with a different scale grid requiring you to divide your things by size and arrange them in an order. The larger grid can only hold larger objects, as the smaller ones will just fall through.
Source: design-milk