Puzzle Foundry / a narrow room off the laboratories

The Puzzle Cabinet

Open a drawer. Wake an instrument. Watch a relation reveal itself. Each encounter keeps its own machinery, rules, and consequences.

Choose an instrument.
The cabinet is an index, not the puzzle itself. Open PF-02, PF-03, PF-06, or PF-07 to operate the complete working instrument; 111 Westminster and The Common Frame remain distinct story-owned objects. SELECT A DRAWER · READ THE PREVIEW · OPEN THE FULL INSTRUMENT

Farside Lock / story instrument111 Westminster

Architectural state instrument

Mercury at an orbital threshold, facing the luminous ascending relations of The Invisible Ladder — THE INVISIBLE LADDER / A WINDOW INTO THE FOUNDRY

Choose your encounter.

The drawers open four working mathematical instruments and two story-owned encounters. Explore, operate, and return without erasing what you learned.

PREVIEW ≠ INSTRUMENTRETURN ≠ RESETSTORY OBJECT ≠ PUZZLE OWNER

Six-chamber silver probability maze with branching transition paths and gold state markers

PF-02

The Parity Maze

This drawer previews the six-room probability instrument. The full encounter remains a distinct Puzzle Foundry object, with Projection II as its established learning origin and return when entered from the House.

Spectral field with harmonic lines surrounding an intentionally absent component

PF-03

The Note That Is Not There

This drawer previews the signal / spectrum / percept instrument. Puzzle Foundry retains the puzzle identity even if a separately authorized Perception Laboratory receiver is later used.

Recursive serrated feedback geometry showing alternating growth and convergence envelopes

PF-06

The Gain With Teeth

This drawer previews the discrete feedback instrument. Its exact recurrence and reasoning sequence remain separate from the Projection House continuous-time lesson.

Mercury facing luminous ascending steps toward the remote Black Knight object.

The Invisible LadderThe complete visual threshold belongs to PF-07. Its logarithmic tuning instrument reveals route geometry; route authority remains a separate question.

Enter PF-07

THE COMMON FRAME / REGISTRATION TABLE

SOURCE A · WITHDRAWN ARCHIVE
SOURCE B · INDEPENDENT TRACKER
DRAG BLUE RECORD · MATCH ORIENTATION MARKERS

01 · Registerrecords reconcile

02 · Withheldindependent point

03 · Conditionrelation survives

04 · Transitinterface permitted

05 · Authority / assentstill not created

REGISTRATION RESIDUAL · UNRESOLVED

Challenge. Bring the blue archive record into the gold tracker's frame. Translation and orientation must both reconcile. Then test the withheld observation. Success opens a Mercurial interface transition—not a literal story portal.