<p>Ernst Marti devoted his life to researching the 'etheric realm' ? a subtle area that exists between the physical and spiritual. Taking the numerous statements and references by Rudolf Steiner as his starting point, Marti develops our understanding of the etheric world in various fields ? from the theory of knowledge to the natural world, through to music, the realm of colours, eurythmy and medicine. In doing so, he proposes exciting bridges fr...