You can set out to do a photograph with a clear cut idea in your mind’s eye, but it is in the transitional period of the realization where it all happens.  There is an unconscious metamorphosis in the creative act which does and must exist.  The link or missing link between intention and the realization is always an enigma to me. Marcel Duchamp described it as often being: ” … the unexpressed but intended and the unintentionally expressed”. Ian Patrick