Penultimate Unit

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

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.