Tantric yantras are precise geometric forms that have been used for centuries as tools for self-realization and the attainment of mystical powers. In Tools for Tantra, Tantric practitioner and scholar Harish Johari has re-created the exact colors and proportions of the primordial yantras along with step-by-step instructions for their accurate construction, coloring, and use.
Harish Johari (1934-1999) was a distinguished North Indian author, Tantric scholar, poet, musician, composer, artist, and gemologist who held degrees in philosophy and literature and made it his life's work to introduce the culture of his homeland to the West. Here is a hot link to a web site dedicated to Harish Johari's work that was set up by his students. http://www.sanatansociety.com/artists_authors/aa_harish_johari.htm