Mystical systems
Dodecahedron
Direct answer
Dodecahedron: The dodecahedron is the Platonic solid with twelve regular pentagons for faces, three meeting at each of its twenty corners, and thirty edges. Plato gave it to the heavens as a whole.
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At a glance
- Also called
- twelve sided solid
- Found in
- Mystical Systems
- Related
- Platonic Solids, Timaeus, Icosahedron, Golden Ratio
The dodecahedron is the Platonic solid with twelve regular pentagons for faces, three meeting at each of its twenty corners, and thirty edges. Plato gave it to the heavens as a whole.
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What is a dodecahedron?
The regular dodecahedron is the only one of the five solids built of pentagons, and because the pentagon carries the golden ratio, the ratio runs all through it. It has twelve faces, twenty corners and thirty edges, and it is the partner of the icosahedron, each having as many faces as the other has corners.
Plato treats it apart. Four solids go to the four elements, and of the fifth he says only that the god used it for the whole, arranging the heavens with it. Later writers linked it to the aether, the fifth element, and sacred geometry still calls it the solid of spirit or of the cosmos. Its twelve faces invited a match with the twelve signs of the zodiac, which Plato's text does not itself draw.
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What sets Dodecahedron apart
The dodecahedron is the odd one out in Plato's scheme, and its later fame comes from that. It cannot be built from the two triangles he uses for the other four, so he gives it no element and one cryptic sentence. Everything said since about spirit, aether and the cosmos grows from that sentence. It is also the most demanding of the five to construct, needing the pentagon and with it the golden ratio, which may be why legend makes its disclosure a crime.
- Faces, corners, edges: twelve, twenty and thirty
- Face shape: regular pentagon, three meeting at each corner
- Dual: the icosahedron
- In Plato: used for the whole heavens; no element assigned
- Legend: Hippasus drowned for revealing it, a tale told by Iamblichus
- Roman bronzes: over a hundred hollow examples, second to fourth century CE, purpose unknown
Often mistaken for something else: The icosahedron has twenty triangular faces and twelve corners; the dodecahedron has twelve pentagonal faces and twenty corners.
The story behind Dodecahedron
A late legend, told by Iamblichus, says the Pythagorean Hippasus was lost at sea for making public the construction of the figure of twelve pentagons. Euclid builds it in the thirteenth book of the Elements. More than a hundred small hollow bronze dodecahedra with knobbed corners and round holes, of the second to fourth centuries CE, have been found in the north-western Roman provinces. No ancient text mentions them, and their purpose is unknown.
Why Dodecahedron matters
Dodecahedron is the solid where geometry, the golden ratio and the idea of a fifth element meet, which makes it the favourite of later symbolism.
How to read Dodecahedron
Geometers study it with the pentagon and the golden ratio; sacred geometry gives it to the aether; game players know it as the twelve-sided die.
Dodecahedron in practice: an example
A visitor to a museum in Britain, France or Germany who sees a knobbed bronze dodecahedron is looking at an object nobody has yet explained.
Where readings of Dodecahedron go wrong
Confident accounts of what the Roman bronzes were for are guesses, since no record of their use survives.
Sources and editorial method
This entry summarizes the tradition in the Almanac's own words; where no source is listed, it is an editorial summary rather than a primary text, and symbolic readings are named as the tradition's, not as fact.
- Source
- The Great Almanac Dictionary
- Category
- Mystical Systems
- Aliases
- dodecahedron meaning, dodecahedron sacred geometry, roman dodecahedron, dodecahedron fifth element, twelve sided solid
- Last updated
- 2026-09-26
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Common questions
What is a dodecahedron?
It is a solid with twelve faces. The regular dodecahedron, one of the five Platonic solids, has twelve regular pentagons for faces, twenty corners and thirty edges.
What does the dodecahedron stand for?
In Plato's Timaeus it is the figure used for the heavens as a whole, set apart from the four elements. Later tradition made it the solid of the aether or fifth element, and modern writers call it the solid of spirit.
What were Roman dodecahedra used for?
Nobody knows. Suggestions include a measuring device, a candle holder, a gauge, a game piece and a ritual object, and none is confirmed. They are found mainly in Gaul, Britain and Germany, and no Roman writer describes them.
