Middle/bottom - Stack floor shelf by Kristina Dam Studio. Materials: Solid oak & walnut with oil treatment. Dimensions: 25 x 100 x H 46cm. Add extra storage to your Stack Floor Shelf System with this "add-on" shelf. Buy this "add-on" Stack Floor Shelf if you want to stack several units on top of each other. To do this you will first have to buy the starter unit named "Stack Floor Shelf - Single". To this single shelf, you can then add several more shelves to your setup by choosing this add-on unit. The Modernist furniture collection takes notions of modern design and yet the distinctive design touch of Kristina Dam Studio is evident in every single piece. Tangible and honest design for the modern interior.