Thought Forms (libro en Inglés) - Annie Besant; C.W. Leadbeater

A classic of the Theosophical tradition, this treatise explores the concept of what thoughts "look" like. Written by a pair of prominent Theosophists, it provides a way to visualize the invisible realms within and around us. These simple, clearly expressed, and well-illustrated discussions address the meaning of color, thought forms built by music, the nature of helpful thoughts, and related subjects.