Model
Folding instructions: Penultimate Unit
This is the primary page for this model.
Type: single unit (implies: single-sheet)
Author: Robert Neale
Models using this unit: Menger Sponge (level 1½), Rhombicuboctahedron, Spiked Icosahedron, Steinhaus Puzzle, Truncated Icosahedron, Truncated Octahedron, Dodecahedron with prisms on all faces, Octahedral Lattice, Decorated Icosidodecahedron, Icosahedron, Modified Buckyball (120 edges), Decorated Dodecahedron, Golden Ball, Pentagonal Snowflake, Decorated rhombicuboctahedron, Snub Cube, Cube (Penultimate Unit), Dodecahedron (Penultimate Unit)
In albums: Simple models

108° variant (for edges of pentagonal faces), side view 108° variant (for edges of pentagonal faces), back 90° variant (for edges of square faces), side view 90° variant (for edges of square faces), back 120° variant (for edges of hexagonal faces), side view 120° variant (for edges of hexagonal faces), back Usage example: Dodecahedron Usage example: Cube Usage example: Truncated Icosahedron Usage example: Menger Sponge Usage example: Decorated Icosidodecahedron Usage example: Decorated Rhombicuboctahedron
Images are licensed under the Creative Commons Attribution-NonCommercial 4.0 International License

Penultimate Units are a family of very simple and very versatile modular origami designs which can be used for building a variety of different polyhedra. Modifications of the unit are possible which extend its applications even further.

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