" The integrative powers of life are manifested in the phenomena of symbiosis between organelles, in the varied forms of partnership within the same species or between different species; in the phenomena of regeneration, in lower species, of complete individuals from their fragments; in the re-formation of scrambled embryonic organs, etc. The self-assertive tendency is equally ubiquitous in the competitive struggle for life. "

― Arthur Koestler , The Ghost in the Machine