Following the
tetraedron and the
hexaedron, the dodecaedron is made of twelve pentagons (the seeds of the starfishes), linked together by twenty triangles forming a surprising shape. This shape was done following a very nice tutorial by the regretted Jonathan Johansson (France), also known as Sjoo (DeviantArt).
This version is thick and sturdy. A thin, flexible, cheaper and yet resistant version is available
here.