Posts Tagged ‘polyhedra stamp’

icosahedron and Euler’s formula / 正二十面体とオイラーの多面体公式

September 19, 2018

6 September 1983, German Democratic Republic
Death Bicentenary of Leonhard Euler
design: A. Bengs

The out-line geometry is Icosahedron and the formula is thought by Euler on the right.  The formula is “v (vertices) – e (edges) + f (faces) = 2” in English.  Some people think this is very beautiful formula – well, for me as non-mathematician, polyhedra as three-dimensional objects are more attractive.

左に描かれている立体は正二十面体で、真ん中に「オイラーの多面体公式」があり、右がそのオイラー本人です。この公式は、( 頂点の数 )- (辺の数 )+ (面の数) = 2 というもので「世界で二番目に美しい数式」という本が上梓されていますが、、、数学者ではないわたしにとっては、立体の多面体のほうがよほど魅力的に映ります。

polyhedra in nature / 自然界の多面体

August 29, 2018

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.



Impossible object / 不可能図形

July 19, 2018

16 February 1982, Sweden
“Impossible Triangle”
designer: Oscar Reutersvärd
engraver: Czesław Słania

Nine cubes are floating in the air – and if you look closely, you notice that this is an “impossible object“.  Oscar Reutersvärd is an artist who started to draw these figures earlier than Escher, in the 1930s when he was still 18 years old – and he made a lot.  It seems this stamp was designed by him, and engraved by Slania.  What a gorgeous collaboration yet humble looking – a stamp treasure!


rotating Cube / 60度傾く立方体(正六面体)

July 15, 2018

10 November 1970, Netherlands
“Children’s Stamp”
design: William Graatsma & Jan Slothouber

A different colour variation of Cube stamp – well, just being rotated 60 degrees.  I wonder why, but somehow it does not look like a three dimensional Cube, seems more like a 2 dimensional graphic for me.


octahedron / 正八面体

June 22, 2018

12 January 2012, Sweden
designer: Fideli Sundqvist
engraver: Piotr Naszarkowski

This is an outline of an Octahedron, which is one of the five Platonic Solids.  Only five polyhedra have equal shapes of faces and vertex with the same numbers of edges meeting at equal angles! ( well, for a lot of people it is a matter of fact…  I am amazed, though )

I like to see polyhedra with hidden lines behind the front faces.  So, this is my favourite model, as well as being a crisp intaglio print.  I would be so pleased if I received a letter with this stamp on it!



great stellated dodecahedron or? / 大星型十二面体それとも?

May 28, 2018

9 November 1973, Germany
design: I. Monson-Baumgart

One more stamp from the same Christmas season, which I had already posted in 2011.  At that time I just thought it is a beautiful stamp – now I notice that this looks very much alike to a Great stellated dodecahedron.  But it is another 2D illusion and still I love it – crisp intaglio print with 70’s colours.