A sack that knows it was caught.

You do not need one

A sey circle needs three people and something soft. A rolled sock works. A crochet sack works better, because it lands where it is caught instead of rolling under a car.

The B-Sey™ ball will never be required to play sey. The rules are CC0 and belong to everyone, so we could not make the sport need a product even if we wanted to — no permission to play can be withheld, including by us. If a ball ever becomes the price of a game, this page was the mistake.

What it adds

A point can be recorded three ways, and each one degrades into the one below it.

• The call implies it. The caller said a name and the sack went there. No hardware, and this is the default.
• The phones agree. Where several phones are in the circle, they vote on whether they heard the catch.
• The ball confirms it. It felt the impact and says so.

Sensing never gates play. A circle with no ball plays the same game with the same rules, and every record carries which of the three it was — unvalidated, mic-validated, ball-validated. A record that cannot say how it knows is worth less than one that admits it was only implied.

Why it can be this small

The caller has already said who touches the ball next. So the ball never has to work out who — only whether.

That is the whole reason this is a cheap object. Working out which of eight people caught something is a ranging problem and needs a system. Confirming that something was caught is an accelerometer and a timestamp.

What is inside

A soft sack, not a hard ball. An accelerometer and a small radio, potted and suspended at the centre, so the sack is its own shock absorber and there is nothing rigid to land on.

No speaker. The phones in the circle already say the names out loud, and a second voice in the middle would be one more thing to talk over.

A sealed rechargeable cell, not a coin cell — and not removable. Coin cells are swallowed. That decision is made, and it will not be revisited for a thinner ball.

The radio is a pre-certified module, so it arrives carrying its own certification rather than waiting on ours.

What leaves the ball

The identifier it broadcasts rotates. A ball that advertises a fixed one is a child-tracking beacon that anyone on the street can follow, and no amount of good intent later fixes a number that was constant. Its stable identity is held on the device and never goes out over the air.

What it senses aggregates to the circle. Never to a player. An accelerometer supplies the umpire with evidence; it never supplies the caller with a reason.

The ball keeps its own biography — games, courts, dedications. Collective records only. Nothing it stores is about a person, and adding a sensor is exactly how a guarantee that used to be kept by the absence of data gets quietly reopened. It is not reopened here.

You never own one

You never own a B-Sey™ ball. You keep it between gifts.

Who makes it

Made by Factory 333™

The supply chain is witnessed: an audited factory, a named supplier, and a stated floor. Those are checkable claims, which is the only kind worth printing.

Where this actually is

There is no prototype, no tooling, and no certification started. There is nothing to ship, and no date to give you.

There is no price either. A number here would be a guess dressed up as a commitment.

Reserve a place

Reserving costs nothing and commits nothing. No card, no charge, no price. It records that you want one, and one verified way to reach you when there is something real to say.

Reserving is for adults. A ball is something bought for a circle; it is not something a circle needs.

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Go and play

Three people and something soft to throw. That is the whole requirement, and it was the whole requirement before this page existed.