丹田 (tanden)
In Japanese culture, tanden is the source of ki and is located just below the belly button. Master Takase discusses this in detail in an excellent article Hara: Master Calligrapher Eri Takase on the Art and Energy of Japanese Calligraphy.
Also see the Wikipedia article Dantian for more information.
Tanden
Block Horizontal
Tanden
Cursive Horizontal
Tanden
Semi-Cursive Horizontal
Tanden
Block Vertical
Tanden
Cursive Vertical
Tanden
Cursive Vertical
Tanden
Design Vertical
Tanden
Semi-Cursive Vertical