Does anyone know the steps to form a spiked octahedron? The URL of a
sample spiked octahedron > http://hektor.umcs.lublin.pl/~mikosmul/origami/spiked-octahedron-sonobe.jpg
This is one of the standard models built from Sonobe units.
A good guide to making this and other standard models can be found here:
http://www.akpeters.com/previews/Mukerji_Excerpt.pdf
http://home.comcast.net/~meenaks/diagrams/sonoassm.pdf
Instructions for making the unit can be found here:
http://www.math.lsu.edu/~verrill/origami/sonobe/
http://britton.disted.camosun.bc.ca/origami/sonobe.html
hope that helps
Joe Power