The sphenomegacorona
The sphenomegacorona is Johnson solid number 88:
Sphenomegacorona, view 1
42 pieces: 12 balls, 28 rods, 2 squares (238.44 g)
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Sphenomegacorona, view 2
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It is easy to make arches joining several sphenomegacoronae directly, but a ring cannot be made with this method:
Arch of 9 sphenomegacoronae, view 1
330 pieces: 84 balls, 228 rods, 18 squares (1.83 kg)
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Arch of 9 sphenomegacoronae, view 2
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We use arches made of four sphenomegacoronae for the curved sections of the columns of Chapel 10.
