Edwards has researched projective geometry for more than 40 years. He is clearly an authority. - Child and Man

Contains many geometrical illustrations throughout and can be approached by anyone willing to think and draw, without previous geometrical knowledge. The reason why modern materialists are unable to understand anything of a spiritual nature is that their ways of thinking, based purely upon sense perception, are much too rigid. Books such as this can help loosen such rigidity. - New View, December 2003
Lawrence Edwards researched and taught projective geometry for more than 40 years. Here, he presents a clear and artistic understanding of the intriguing qualities of this geometry. Illustrated with over 200 instructive diagrams and exercises, this book will reveal the secrets of space to those who work through them. It is also a valuable resource for Steiner-Waldorf teachers.

http://www.amazon.co.uk/gp/product/0863153933