FoPP 023 1.II.15 Post Practice Improvement (PPI)

There is only a certain amount of improvement you can expect during practice at one sitting, because there are two ways in which you improve. The first one is the obvious improvement that comes from learning the notes and motions, resulting in immediate improvement. ... The second one is called post practice improvement (PPI) that results from physiological changes as you acquire new technique ... http://www.pianofundamentals.com/book/en/1.II.15

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You can learn piano up to 1000 times faster (!) compared to other methods. This is the first book ever written on how to practice at the piano. For hundreds of years, many teachers and other books taught you what techniques to acquire, but that is of little use unless you know how to acquire them quickly, as Mozart, Liszt, etc., did.