To show the dynamic process in dreams Carl Jung was interested not only in single ones but in a series of them, especially as in a number of dreams he could discern the processes in the unconscious leading to individuation. The writing down of dreams—it may be noted—was used by Sigmund Freud in his self-analysis. Jung himself did the same and indeed kept two books : the 'black book' and the 'red book'. By recommending the patient to write down dreams he is inducting him into an ongoing process, and regression, with its accompanying dependence on the analyst, is limited. Jung chose a case that was a good one for demonstrating the use of amplification. In practice its use by therapists varies within wide limits. Dream analysis, inaugurated by Freud and used by Jung, is still, as it was originally, the royal road to the unconscious.