THE
MARK

THE MERIDIAN One colour, three strokes, an open instant. Shown at full size, 64, 32 and 16 pixels.

Ostrium's symbol is not a letter and not a logo built for marketing. It is the configuration of the institution's instrument at midnight, drawn as a mark. The homepage film forms it before the masthead shows it.

THREE STROKES

The arc
The final stretch of the clock arc, descending to an instant. Elapsed time, seen at the end of the day where the milestones cluster.
The line of sight
The line from the Aperture's opening to 24:00, rising to meet the arc. Observation and measurement.
The continuation
The datum carried past midnight into Day Two. The line does not stop at the boundary.

The arc and the line of sight both stop short of the point where they would meet. The instant is left open: the question remains open. Closing the gap would turn the mark into a claim.

WHERE IT COMES FROM

FIG. 1 / DAY TWO, 21 SECONDS INTO THE FILMThe instrument quiets. The clock arc, the line of sight from the Aperture and the Day Two datum remain, each stopping short of the oxide instant at 24:00. The masthead mark registers at the same moment. The landscape and observatory are generated illustration.

In the film the line of sight is nearly level, because the observatory stands on the horizon. The mark tilts it to 12° so the angle survives at small sizes. That is the only deliberate difference between the instrument and the symbol.

CONSTRUCTION

Construction of the mark: an arc of radius 34 sweeping 70 degrees, a line of sight at 12 degrees, both stopping 5.5 units from the instant, and a continuation of 15 units. 70° 12° r 34 open instant · 5.5
FIG. 2 / CONSTRUCTIONOn a 64-unit grid: arc radius 34, sweep 70°, line of sight 12° and 37 units long, gap 5.5, continuation 15, stroke 6, square ends. Below 24 px a small cut widens the gap to 8 and thickens the stroke to 8 so the instant stays open at 16 pixels. The oxide point marks the instant in the registered version only.

COLOUR AND MOTION

The mark is one colour: ink on paper, bone on charcoal. It never depends on oxide. The registered version, with an oxide point in the open instant, appears only where the instrument is present: the film's final state and the seal on constitutional documents.

Its only motion is registration: the arc descends, the line of sight rises to meet it, then the line continues, in 720 milliseconds. It plays when the film forms the mark, never as decoration, and not at all with reduced motion.

WHAT IT IS NOT

Not a stylized O, a camera aperture, an orbit or a target. Not a picture of a building: the observatory it comes from is fictional. Not a result: the open instant is the point.

HOW IT WAS CHOSEN

Twenty constructions were drawn in five families: compression, open horizon, recursive instrument, temporal compression, and unknown to reality. Each was tested at 16 pixels, in one colour and blurred. Two independent AI reviewers, not a human panel, compared three finalists without being told a preference, and both chose this one. A later review read an earlier version as "D-", so the arc was shortened to a 70° sweep.

FILES

Keep at least a quarter of the mark's height clear on every side. Do not rotate it, close the gap, add strokes, enclose it in a shape, recolour the strokes or set it below 16 pixels.