Building with Butterflies shows you how to build stunning modular origami sculptures from simple units folded from ordinary paper without the use of cuts or glue. Clear diagrams and instructions guide you through the whole process, how to fold the very simple units (or modules), how to put them together into basic modular structures, then how to combine these basic structures into large and beautiful sculptures. This is the second and much expanded edition of this classic work which remains the out and out leader in the field.