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August 24, 2026

The tessen, an iron fan, appears in photographs and accounts of O-Sensei Morihei Ueshiba. Two misunderstandings have grown around it: for some, it is a secret weapon you can separately "train in"; for others, a relic from another age with nothing to say to modern practice. Both answers miss what the tessen actually is on the mat: a tool of the same axis of movement Aikido teaches. Center. Breath. Line. Intent.

On the mat the topic comes up plainly. You are holding a jo, we are working through weapon basics, and at some point someone asks: "when will we practice something with a fan? There is footage of O-Sensei training with a tessen." The question is honest and good. The answer is rarely what the person expects.

A weapon in the hand or a souvenir on a shelf

The first misunderstanding sounds like this: since tessenjutsu — the art of using the war fan — existed, it must be a separate path of study, a set of secret techniques one has to acquire in order to be complete. Behind it stands a romantic aura: the fan that could not be taken away from a samurai at court, the weapon hidden in plain hand, the strike nobody sees coming.

The second misunderstanding runs the other way: since nobody carries a fan today, the whole subject belongs in a museum. A keepsake, a historical curiosity, a decorated object behind glass. Training should have nothing to do with it.

Both attitudes share one blind spot: they look at the object instead of the movement. In budō a tool is never just an object. It is a way of ordering body, breath, and decision. Watch a child pick up a spoon, a stick, and drumsticks: three different qualities of the same arm. The fan changes nothing in that equation — it simply reveals it well.

A short weapon with a long history

History deserves its due. The war fan existed in several forms: the heavy gunbai in a commander's hand, used to give signals and deflect arrows; the steel gunsen and tessen, used to parry, strike, and control a wrist. Japan developed schools dedicated to its use — tessenjutsu — and the legend of Nasu no Yoichi, who at Yoshitsune's command brought down a fan hoisted on the mast of an enemy boat at Yashima, still lives today.

There was also a practical reason, simple and unglamorous: a fan could be carried where a sword could not. Castles, temples, courts. A weapon that does not look like a weapon stays in your hand while others must be left at the door. There is no secret science here — only the very real need of an armed man to protect himself in a world of blades.

Closed, the fan works like a short stick: it adds weight to a strike, lets a lever control the wrist, completes an atemi at close range. Open, it screens the line of sight, gathers the opponent's attention onto itself, sets an edge and a distance. Every function here is familiar to anyone who has picked up a bokken or a jo. The tool differs; the principle does not.

That is exactly why we do not teach a "school of the fan" in Aikido. The historical context of tessenjutsu is one thing. Our practice is another. Mixing them leads to the mystification of weapons — to stories in which the object receives powers that belong to movement, not to things.

The fan in O-Sensei's hand

So why talk about the tessen at all? Because in O-Sensei's transmission the fan speaks a language entirely different from a weapons manual. In photographs and in students' accounts it appears inside demonstrations of technique, in grips on the wrist, in work with atemi — but also in a ceremonial context: misogi, purification, marking space and intent. Closed in the hand at the start of a movement, open as an unmistakable "here and now", put away when the work is done.

This is not a separate system beside taijutsu. It is the same axis. In the line we practice, sword and jo are not accessories to "empty-hand" techniques — they are the matrix of movement: precision of the edge, honest distance, decision without wind-up. The tessen fits precisely into that place. Once you understand why cutting with a bokken teaches a straight entry into shomenuchi, you understand why the tessen adds nothing new yet puts everything in order.

O-Sensei's budō was not a collection of weapons. It was a practice of purification: technique, breath, and intent gathered into a single action. The tool in the hand exists so that this unity can be seen more sharply. When the tool disappears, what remains is in the body.

The next repetition, without the fan

If there is no separate "tessen in Aikido" curriculum, what concretely changes on the mat? Several things — starting with your very next repetition.

First: the edge. Take a jo and do ten suburi as if you were holding a closed fan — short, precise, no large arc. For most people the first three repetitions come out too wide. That is information about how your arm and elbow are working today, not evidence that you "lack strength".

Second: atemi. Picture a closed fan in your hand as you enter with irimi. A short line, no wind-up, target at the center of mass. People who swing their whole arm usually feel for the first time, after this visualization, that a strike can be short and heavy at once.

Third: ma-ai. An open fan is a border on which the partner's attention leans. In empty-handed work, that same border is your distance and your angle of entry. If you let the partner cross it without consequence, technique will start guessing instead of working.

Fourth: intent at the beginning and the end. Fan closed at the bow, opening with the first movement, closing after zanshin. Do this deliberately three times during class and check how often, between "I began" and "I finished", your attention truly sat in one point.

None of these exercises requires a fan. All of them require what the fan puts in order: center, breath, line, direction. If your line falls apart without the tool, the tool is not what it was missing.

The things you hold in your hand

Outside the dojo, too, the subject needs no exoticism. Each of us holds something every day that works like a tessen: a tool that orders the hand, and through the hand the attention. A pen before the first sentence. The key that opens a workshop. Instruments before surgery. A steering wheel on a rainy evening.

Notice what the hand does then. It does not wave. It gathers. A good craftsman before work holds silence in the hands, not tension. This is the same discipline we train on the mat: gather your center before you move; hold the line while you move; finish the action to its end, not halfway.

One more thing about the tessen is worth keeping, and it is neither mystical nor specifically Japanese: the ritual of beginning and ending. Fan closed before you start. Open while you act. Closed when you are done. That is what any honestly completed work looks like — from kata with weapons to a conversation that was supposed to be difficult and turned out simply truthful.

So I return to the question from the mat the same way every time. We will not learn "fan fighting". We learn movement, for which the fan was only one of many hands. The rest is history — beautiful, but somebody else's. Ours begins with the next repetition.