Cardboard can be seen as poetry of everyday things. Whether it is simple packing material or a box to keep things in. The simplicity appears the determining factor for the success, like for instance a box with a sunflower or a box with a wax seal or a box with a dial, without hands suggesting it wants to stop time. One by one these are unique specimems. It is estimated that Pablo made about a hundred of this kind, 53 of them have been traced.