We should move to Japan.

[navelknife]

'In martial arts, the Hara or Dantian is sometimes considered as equivalent to the lower of the three dantian (tanden in Japanese!). Various styles of martial arts describe this as being just below or directly behind the umbilicus.[21] In Traditional Chinese Medicine (TCM) the by-name Dantian is given alternatively to three acupuncture points: the "Gate of Origin" (Ren 4), and the "Sea of Qi" (Ren 6),[22] and, by some, also to the "Stone Gate" (Ren 5).[23] All three points are situated on the midline (centre of the linea alba) of the lower abdomen (i.e. below the navel). They constitute part of the Ren Mai, usually translated as Conception Vessel (CV), which is one of the Qi Jing Ba Mai, the Eight Extraordinary Vessels or eminent energy pathways of the body.'

https://en.wikipedia.org/wiki/Hara_(tanden)

i understand what the paragraph tries to convey
it's part of my culture, i am Taiwanese and i read Kanji characters

navel is also a spot for acupuncture point, called 神闕穴 (shen que xue) literally "God/Heaven Gate acupuncture point"
and i am very good at penetrating this acupuncture point

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They have a navel festival there.   Their culture clearly has some reverance of the Navel or Hara. I kind of wish we had this too. 

its because this city locates in the center of the island Hokkaido
center spot is like navel of a body
so the citizens created this festival to boost local tourism