`Structure' refers to the actual components and the actual relations that realise a particular composite unity. While the organization is necessarily invariant (to conserve identity) structure is not. Structure is in continual change. Structure entails many more dimensions, more relations than organization. Organization can therefore be seen to be a subset of structure. The Organization is always realised through Structure. We all structurally change continuously in our co-drifting. Living is a structural drift and lasts as long as Organization and correspondence with the medium is conserved.