· Polyhedra are solids consisting of polygons (faces). These are joined together by edges and vertices (corners).
The polygons in the five regular
polyhedra (Platonic bodies)(alt)) are triangles, squares and pentagons. Only one kind of polygon is
present in each regular polyhedron. These are the tetrahedron,
cube, octahedron, dodecahedron, and icosahedron. Four other
polyhedra are considered to be of regular type: the small
stellated dodecahedron (with 12 pentagrams), the great
stellated dodecahedron (with 12 pentagrams), the great
dodecahedron (with 12 pentagons), and the great icosahedron with 12 triangles.
The five Platonic bodies can be circumscribed by a sphere touching the vertices. A sphere can be inscribed touching the centers of the polygons.
The 13 semiregular polyhedra (1, 2, 3,) Archimedes´ 13 semi-regular polyhedra contain furthermore three polygons : hexagon, octagon and decagon. Two or three different polygons are present in each semiregular polyhedron. The 13 semiregular polyhedra can be circumscribed by a sphere touching the vertices. A sphere can not be inscribed touching the centers of the polygons.
The circle and the sphere were considered to be the most harmonic figures; in ancient Greece but also even until the Renaissance, eg by Johannes Kepler.
Duals of polyhedra (reciprocals) are constructed by connecting the centers of the polygons. Then the surfaces and the vertices change places. The number of edges remains the same. All polygons are identical. The duals to regular polyhedra (1 , 2) are still regular polyhedra. The duals to semiregular polyhedra are new polyhedra; e.g. the dual to the cuboctahedron is the rhombic dodecahedron. A sphere can be inscribed in the duals touching the centers of the polygons .A sphere can not be circumscribed the duals .
Prisms, according to Kepler, are formed from two polygons in parallel planes connected by a ring of squares or rectangles.
Antiprisms, according to Poinsot, are similar but the ring is composed of isosceles triangles.
Non-regular polyhedra. There are 92 possible.
The oldest known regular polyhedra are carved stones from the Neolethic time ,about 1 000 years before Plato.
· Several of the regular polyhedra (alt) and the semiregular cuboctahedron were known in Babylon, Egypt, India and China (c. 3 000 - 2 000 B.C.). The geometry was developed during the golden period of ancient Greek culture (c. 700 - 100 B.C.)
Plato /427 - 347 B.C.) described the five regular polyhedra in his dialogue Timaeus These polyhedra are later named the five platonic bodies or solids
Euclid of Alexandria(c.325 – c.265 B.C.) described in Elementa (in Greek : Stochein) the regular polyhedra and polygons and their relation to spheres (Book XIII) and circles. He described combinations of regular polyhedra. However, he did not describe the surface or the circumference of the circle. The Elementa was based on previous works by eg. Plato, Eudoxus, Theaetetus. It is divided in 13 books. More than 1 000 editions of the Elementa has been published since it was first translated to Latin from Arabic in 1482. The first edition translated to Latin from Greek was published in 1505.
The 13 semiregular polyhedra (1, 2, 3,) were described by Archimedes (c. 257 - 212 B.C). Eleven of the 13 can be constructed by truncation of the regular polyhedra. In his work On the sphere and cylinder Archimedes proved that the ratio of the volume of a sphere to the volume of the cylinder, that contains it, is 2 : 3. He also proved the same ratio of the surfaces of the sphere and the cylinder.Archimedes requested his friends that they would place over his tomb a cylinder containing a sphere (Plutarch AD 45-120). Cicero saw (75 BC) the tomb, at theAgrigentine gate, with a column surmounted by a sphere and a cylinder. It was partly damaged.
In Mouseion in Alexandria (from c. 300 B.C), with a library with c. 700 000 scrolls, the geometry was commented by e.g. Pappi Alexandrini (Pappos) and Heron Alexandrini. Archimedes' work on the semiregular polyhedra was lost but previously commented by Pappos in his Collectiones.
During the period of Arabic high culture (c. 700 - 1 200) the Greek geometry literature was translated to Arabic.
In the Renaissance (c. 1300 - 1600) the Greek literature was translated to Latin from Arabic and later from Greek.
Pierro della Francesca (1412 - 1492) studied the five regular platonic solids and six of the semi-regular Archimedean polyhedra ; truncated cube, truncated tetrahedron, truncated octahedron, cuboctahedron, truncated icosahedron, truncated dodecahedron. He has several references to Euclid´s Elementa.
Luca Pacioli (1445 - 1518) described the Platonic bodies and six of Archimedes´ 13 polyhedra. Leonardo da Vinci drew the polyhedra in Pacioli´s book De Divina Proportione . He did not know of the Collection by Pappus and thought that there were an unlimited number of semi-regular polyhedra .
Johannes Kepler (1571 - 1630) studied the polyhedra in several ways in his works Harmonices Mundi and Mysterium Geographicum. The illustrations of the polyhedra were drawn by W.Schickard , a professor in mathematics. He tried to find a relation for the distances between the five known planets and the five regular polyhedra but had at last to give up. He studied the rhombic dodecahedron and the rhombic tricontahedron (1, 2,) as well as the small stellted dodecahedron and the great stellated dodecahedron. Kepler gave the names to the 13 semi-regular polyhedra. He was the first to describe all the 13 polyhedra and described the formulas for volume, surface etc.
Albrecht Dürer (1471 - 1518) designed in Underweisung, in 1525, the polygons of the regular polyhedra and nine of the semiregular polyhedra onto a plane, in the form of “nets”. He also designed his own polyhedra (1 ,2)
polyhedra are present in Nature, e.g. the rhombic dodecahedron (1, 2, 3) in bee´s cells,
in pomegranate seeds and in the mineral garnet. Mineral crystals have the form of
several polyhedra. For example:Tetrahedron:silicate
(Si/O) and chalcopyrite (Cu/Fe/S) ; Octahedron: diamond (C), gold Au) and
cuprite (Cu/O); Dodecahedron: pyrite (Fe/S) and cuprite (Cu/O) ; Icosahedron:
pyrite (Fe/S) ; Rhombdodecahedron: garnet (silicates) ; magnetite (Fe/O) ;
Truncated cube : galena (Pb/S) ; Truncated octahedron : cuprite Cu/O) ;
Rhombhexahedron : calcite , graphite ; Octahedra / tetrahedra (closely packed )
: pendiandite (Fe/Ni/S)
Truncated octahedra and rhombidodecahedra have the smallest ratio surface / volume and
can be closely packed,thus saving energy.
The polygons and polyhedra are ralely perfect in nature.There is ,however, a tendency to make energy and closepacking forms. Kepler called this Facultas formatrix.
Radiolaria are silicous plankton of polyhedral structure.
Hexagonal cells in a wasp´s nest
Closest packing (1, 2, ) means that polyhedra fit together without intermediate space. .The truncated octahedron and rhombic dodecahedron have the smallest surface in relation to the volume among polyhedra with closest packing possibility, thus saving space and energy. Several other polyedra have the ability to to be closely packed.These forms are present in animal and plant cells, as well as in beer foam.
In the beginning of the 20th century polyhedron forms were found in atomic, molecular, cluster and crystal structures.
Molecules consisting only of carbon atoms were discovered; the first were that with 60 carbon atoms.This has the form of a truncated icosahedron with 12 pentagons and 20 hexagons, i.e the C-60 fullerene(1 ) (Nobel Prize in chemistry in 1996). This Archimedean polyhedron can also be recognised in the European football from about 1965. Before that time an other type was used.
Zeolites ,aluminiasilicates, of polyhedral structure
The Renaissance artists e.g. Pierro della Fransesca ,Lorenz Stör (1, 2, 3 )Ucello, Hans Hayden ,,Lorenz Zicken, Jean Cousin (id.) Wenzeln Jamnitzer, Luca Pacioli , Leonardo da Vinci used the Greek geometry in their paintings and sculptures. Battista Alberti (1404-1472) described in Della Pittura for the first time the mathematical construction of the perspective with a “centric point”. The first three-diemensional figures to appear were the regular polyhedra , often made in the form of intarsia (wood inlay) by intarsiatori . Giovanni da Verona is one of the most famous.
Dürer designed his own polyhedron in his etching Melancholia.( http://www.artglobe.se/Ghist/ghist_06.htm
In modern art polyhedra occur in pictures and sculptures, e.g. in Dali´s The Sacrament of theLast Supper (takes place in a dodecahedron (alt), http://ellensplace.net/dali.html Dodecahedra also occur in Dali´s Searching for the Fourth Dimension ( 1979), in The Sacrament of the Last Supper, in Roch and Infuriated Horse Sleeping under the See (1947) , in Pentagonale Sardana (1979) and in some illustrations in Esseys of Michel de Montaigne.
Several Russian artists, Malevitch and Rodtjenko were familiar with polyhedron and polygon structures (c. 1920 -1930).
M. C. Escher often used polyhedra in his etchings, e.g. the dodecahedron and the small stellated dodecahedron. Stars, wood engraving 1948, stellated polyhedron.
several artists construct polygons and platonic bodies (alt))as well as
Archimedean polyhedra ,e.g.
Collection of Dodecahedra
K G Nilson : Red Score
Pål Svensson Platonic solids
Per Svensson: : Platonic solids and Truncated icosahedron (id.)
Lennart Mörk: Platonic solids
Legotype of Bauhaus
In architecture, particularly in the USA, polyhedra occur in constructions.
In about 90 excavations in Celtic areas dodecahedra were found. They have 12 holes in the pentagones and 20 spheres on the corners. What they have been used for is unknown.
Cubes used in game of dice have been found in several countries.Icosahedra, octahedra and dodecahedra were also used.
The twelve zodiacal signs ,known in ancient Babylonia, have been found on dodecahedron.
Also truncated cuboctahedra , rhombcuboctahedra and rhombtricontahedra occur in archaeologic excavations.
Cuboctahedral weights were common in The Middle Ages.
1990 Arts Center,
University of Warwick, UK
1992 Forum,Trelleborg, Sweden
1992 Sheraton Hotel, Malmö, Sweden
1993 Tivoli, Copenhagen,Sweden
1995 University Library,Lund, Sweden
1996 Technical Museum,Malmö, Sweden
1996 Royal Society of Sciences, Stockholm,Sweden
Group exhibition (Ingmar Bergström).(Nobel prize exhibition, chemistry)
1997 International Festival of Sciences, City Museum,Gothenbourg, Sweden
Group exhibition (IB)
1998 Steno museum, Århus,Denmark, Group exhibition (IB)
1999 University Hospital, Malmö, Sweden
2000 Slide Show , Scantic Hotel Slussen , Stockholm
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Last modified on 2001-11-11 25 apr 2001