Musubi is a concept that I believes forms one of the core principles of aiki based art forms. Over my years of training I have felt various artists express it in radically different ways but at the end of the day musubi 結び, or connection between centers, is one of the common denominators high level people all have mastery of in their practice.
As I often do, when exploring a concept I love to break down the kanji, the Chinese character to see what secrets lie in store for us.
結び - むすび ending; conclusion; union
結び目- むすびめ knot
結び方 - むすびかた way of tying a knot
So from a budo perspective, I would say
Now let us explore the kanji 結 deeper and explore it's construction and etymology.
to do up (hair); to braid; to fasten; to fix
1: to tie; to bind; to link;
2: to bear (fruit);
3: to close (e.g. deal); to confirm; to conclude;
4: to close tightly; to purse (e.g. lips);
5: to unite (with); to ally; to join hands
Here is what you get if you type 結 into Google search.
The character is made up of two clusters of ideas. 糸 and 吉
糸 a fine thread
Pictographically the writing 糸 represents a twisted string.
吉 - good / lucky / auspicious / propitious / favorable / fortunate
the speech 口(mouth) of a sage 士(a man of learning) = 吉 auspicious
First we see Kondo Sensei, the head of Daito Ryu. He has an intense musubi so it is good for illustrative purposes.
Then we see Stenudd Sensei. Watch as he moves right into the structure of the person. Both Kondo and Stenudd have intense musubi that really sock it to the structre of their partners.
And here I give a brief description of what musubi is and how it is created.
And as a final piece of musubi trivia for the day. Musubi (different character) also means sushi made from spam. Go figure.