‘THE SPINE’ (RHYTHM) – ‘The ‘spine’, or essence, or fundamental quality, or essential character of a thing. You must feel and sense this essence – there is no law about it. [. . .] You must find ‘the spine’ in every feeling, every act, every idea. In some cases it is good to have ‘the spine’ as intellectual idea, and in some cases it must be a sensation or feeling.
