Steiner, Rudolf–Knowledge of Higher Worlds

This book is fascinating-a manual on learning how to perceive in the non-physical world. It’s dense, and the translation leaves a bit to be desired, but I find the exercises helpful and the cosmology resonates well with me. He wrote a more advanced book as well, and a bunch more on his Theosophic cosmology, and a zillion lectures. This is from a system called Anthroposophy. Steiner also came up with Waldorf Education-a wholistic educational approach, biodynamics and eurhythmy.