Spiked icosahedron

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    This kusudama is a refold of an old spiked icosahedron model of mine with nicer paper. It’s a modular design which uses 30 units.

    The unit, which I call the Sturdy Edge Module (StEM), is a variant of an edge unit; I call usage like this the “face variant” since the unit covers a face rather than an edge of the solid. When I invented the module, I though it was very original, but soon I learned it was actually pretty common and had been independently designed by many others before (it’s just a variant of the classic Ow’s edge unit). Dave Mitchell invented this “face configuration” (under the name Cube-Corner Star) as early as 1993.

    origamiPete, ta zupa jest niedobra, and 18 other people added this photo to their favorites.

    1. edwardholmes91 28 months ago | reply

      It looks wonderful Michal, do you have any diagrams for this?

    2. Michał Kosmulski 28 months ago | reply

      Edward Holmes Thank you. You can fold the units (30) according to instructions at michal.kosmulski.org/origami/stem/ . Here, square paper was used but it will also work with other proportions. Then, instead of folding the unit along its long axis, you fold it in half in the perpendicular direction. Three units can then be connected to form a kind of pyramid, and since the base of this pyramid is an equilateral triangle, you can make an icosahedron by connecting 20 such pyramids together (each unit is shared between two pyramids).

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