Eboni Lacey 
09/23/2010
Professor Neil Lawley 
Ch. 6 and 9 summary 

Ch. 6 Summary
	Ch. 6 defines Mass and and Void. As a mass is a filled object, a void is an empty object. Ch. 6 then discusses their differences and still suggests that whether space is empty of filled, it can still be manipulated. It also discusses passive and active voids as passive voids are the space between two solids and active voids are the removal, or subtraction from a solid. It then discusses surface and volume as a enclosed surface ultimately defines volume. It then talks about the ways to enclose volume and provides examples of geometric volume. The chapter finally discusses movement of mass and void and an enclosed surface and how to apply movement with these objects through various manipulation. 
Ch. 9 Summary 
	Ch. 9 is mainly devoted to structure and how to manipulate it. Through compression, tension, bending, torque, and sheer, structure is manipulated. These types of force ultimately distort a structure.  It then discusses ways to distribute force and defines geosides, which are structure lines that lie on a great surface of a sphere. It goes on to talk about surface structures such as shells and tensile surfaces. It then concludes with the joining and attachment. Through focusing on the structure’s center of gravity, the stableness is determined. The closer the center of gravity is to the center of the base, the more stable the structure. It also includes hierarchical and repeated structures.