Sketch for a Systematic Metaphysics, Paperback by Armstrong, D. M., ISBN 019965591X, ISBN-13 9780199655915, Like New Used, Free shipping in the US David Armstrong sets out his metaphysical system in a set of concise and lively chapters each dealing with one aspect of the world. He begins with the assumption that all that exists is the physical world of space-time. On this foundation he constructs a coherent metaphysical scheme that gives plausible answers to many of the great problems of metaphysics. He gives accounts of properties, relations, and particulars; laws of nature; modality; abstract objects such as numbers; and time and mind.