Wayne McEvilly has spent a lifetime mastering his craft: playing the piano, beautifully. That lifetime of learning, practice and thought leads to the ability to improvise beautifully. Think of the understanding of pattern, harmony and music that lets Wayne "noodle around" at his piano, and create this, From A Single Tone.
We don't jump straight to this level of ability in any skill. We get there by learning, practice and thought.
Since I can't embed the video, you'll have to go watch it here: From A Single Tone.