polyhedra in nature

自然界の多面体

12 January 1968, Germany
“Technology and Science”
1000 years of ore mining in Harz Mountains
design: K. O. Blase

Cubocutahedron ( top left ) is one of the Archimedean solids, and the lower right one is an almost Truncated tetrahedron ( well, in progress to be ).  The other two polyhedra are progressions and they must be the crystal shape of chemical formulas of lead(II) sulfide and Zinc sulfide.  Nature is full of wonders!

Using four colours, this stamp is really delicately designed and nicely printed.  I love this crispness.

左上の立方八面体アルキメデスの立体のひとつで、それが正八面体に発展中なのが、その右です。下段は右がほぼ切頂四面体で、左は何から何へ発展中なのか不明。硫化鉛(II)や硫化亜鉛という名前の無機化合物の結晶が、こんなにきれいな多面体なのは、地球の(いえ、宇宙の)驚異だと思うのです。

4色のインクをベタ塗りと線描で繊細に重ね、カリッとした多面体の立体感を出している大好きな切手です。

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