 A fixation at the anal stage might result in excessive tidiness or messiness.Freud recognised that 'it is possible for several fixations to be left behind in the course of development, and each of these may allow an irruption of the libido that has been pushed off – beginning, perhaps, with the later acquired fixations, and going on, as the lifestyle develops, to the original ones'.Ernst Kris supplements Freud's general formulations with a specific notion of "regression in the service of the ego"...the specific means whereby preconscious and unconscious material appear in the creator's consciousness'.