The topic of this book is material objects. Like most interesting concepts, the concept of a material object is one without precise boundaries. A thing is a material object if it occupies space and endures through time and can move about in space (literally move about, unlike a shadow or a wave or a reflection) and has a surface, and has a mass and is made of a certain stuff or stuffs. Copyright (C) Muze Inc. 2005. For personal use only. All rights reserved.