A compact easy reference Lexicon Feng Shui Decoder by Dynamo House.
The Lexicon briefly covers much of the main information on the subject of Feng Shui - Yin & Yange, Chi, Sha, Tao, I' Ching, the Five Elements and much more -coupled with 2 movable wheel style dials that help you understand the meaning and significance of Feng Shui.
It helps you understand if you are living in harmony with your environment and making use correctly of Ch'i.
Its a handy and compact 6" x 6" approx. in size.
An invaluable and easy to use reference source.