Ikigai, kaizen, mushin, shu-ha-ri and wabi-sabi applied to learning and focus.
Mushin (無心) is the empty-mind state that kendo masters and Zen practitioners describe as peak performance. Modern neuroscience recognizes it as flow state.
Shu-ha-ri (守破離) is a Japanese framework for mastery used in martial arts, tea ceremony, and calligraphy.