Zome GeometryHandson Learning with Zome ModelsGeorge W. Hart and Henri Picciotto 

This book is full of fun and beautiful things you can make with the wonderful Zome System geometry construction set. It is a handson guide to the geometry of threedimensional space.
Topics are introduced with engaging challenges to invite exploration. Threedimensional constructions alternate with careful analysis and discussion of the models. Each chapter ends with a list of ideas for further exploration, suitable for projects.
The reader looking simply to construct interesting models and gain
insight
from them may jump into the sections in any order, perhaps thumbing
through
and being enticed by a section's pictures. However, the
mathematical
discussion which accompanies the constructions follow a careful
development,
each section building on previous material.
Green struts: The original Zome
sets contained only blue, red, and yellow struts. Now they make
the
longawaited green struts as well, and the book includes many
constructions
for them. However, it is designed so the material which requires
green struts is optional, so the book can be used by people with either
new or old Zome kits. The book uses three lengths of green struts
which are found in Zome's Advaned Mathematics Creator Kit.
They
also sell a Green Lines Starter Kit which contains those three
lengths plus green struts in six other lengths not used in the book.