The Seam
Network
Microscopic tears in the fabric of spacetime caused by the energy of a temporal signal being received in an era that has no context for it. They are not wormholes. They are not portals. They are wounds.
Seams are microscopic spacetime fractures — not cracks in space, not rifts in time, but both simultaneously. The signal that arrived in 2047 travelled through spacetime, not through time alone. A temporal fracture is therefore a spacetime fracture: each Seam connects different moments and different locations simultaneously.
Critically: this means traversal involves spatial displacement proportional to temporal distance. A 700-year traversal does not return you to the same coordinates you left. You emerge somewhere in Earth's general orbital neighbourhood. Without navigation equipment, spatial drift is a survival risk.
Not wormholes
Wormholes are tunnels between two stable points. Seams are fractures — they have no guaranteed destination and cannot be held open.
Not stable
Seams grow very slowly in eras of low technological density. They grow faster near high-information events.
Not neutral
Every Seam traversal leaves a trace in the spacetime record. The Long Burn civilisation can read those traces. Everything the E7 group does is eventually evidence.
Early Era
2047–2100
Six Seams. Microscopic. Undetectable without instruments. The scientists who know about them are not believed.
Growth Era
2100–2280
Seams accelerate near high-information events: the Ara legal precedent (2100), the thermohaline correction (2124), the entity encounter (2256–2280).
Severance Era
2284–2500
Post-Severance, with civilisational density reduced, Seam growth slows. The network is present but unmapped. Communities rebuild around them without knowing.
Long Burn Era
2780+
Dense enough to map. The Long Burn civilisation has developed traversal protocols and Seam-navigation technology. Traversal is the foundation of everything they have built.
Forward only (without equipment)
Natural Seam traversal moves forward in time only. Backward passage requires Seam-navigation technology, available from approximately 2790.
Spatial drift is mandatory
Because Seams are spacetime fractures, every traversal involves spatial displacement. The further the temporal jump, the greater the spatial drift. A 700-year traversal emerges somewhere in Earth's orbital neighbourhood — not at the origin coordinates.
One-directional cost
Backward traversal is possible but costs energy equivalent to a small star's output. In the entire history of the universe, it has been done exactly once: to send the Origination signal.
The Cost of Backward Traversal
Backward Seam traversal removes a star from the universe. Not metaphorically. The energy expenditure disrupts stellar processes at the targeted source star, initiating accelerated collapse.
Who has the authority to spend a star? Which star? Who decides? In 2803, the Long Burn civilisation answered those questions. Once. The star is still gone.
Nexus Events
When two Seams draw close enough, a brief Nexus occurs. Information can pass freely — visions, sounds, text perceived across time. Small objects can sometimes cross (rare; occurs three times in the whole franchise). Nexuses last between 3 seconds and 17 minutes. None can be predicted or extended.
The device Joel Kirby builds in 2026 activates a precursor-Seam before the signal even arrives in 2047. The group travels without Seam-navigation technology. Every displacement involves uncontrolled spatial drift. The sixty-minute charging window is a function of the device accumulating exotic matter from the local field — the same exotic matter that the Seams generate.
On the Aegean coast in 2312, Priya Okafor's key insight is this: the device has been making the zone around it worse since Day 1. The Seam and the device are not separate systems. They are one system.