The Morphotheek is a set of proportioned objects designed by Hans van der Laan. It contains 120 parts: 60 “blocks”, 20 “Bars”, 20 “slabs”, and 20 “white forms”. When assembled, it has the shape of an eight-layer pyramid built after Van der Laan’s plastic number system. The first layer can be used as a self contained educational tool called the “triangle of forms” (10 blocks, 10 bars, 10 slabs, and 6 white forms).