Resources

• New: On-Site Field Guide (fieldguide.html) — The complete 8-step procedure to solve K4 with pen, paper, and a calculator. No external charts required. Every step traced to a physical witness or public clue.
• f/g decomposition documented: R is no longer just a monolithic lookup table. The on-site derivation path (r = (f + g) mod 26, R = r + gate) is now fully explained on method and field guide pages.
• Cipher classification: K4 formally classified as a spatially-addressed shift cipher using standard alphabet arithmetic.
• Master constants: Eight numbers (0, 3, 4, 11, 13, 19, 24, 1) sourced from on-site features, documented across solution, method, and field guide pages.
• Clue mapping table: Every Sanborn clue (OBKR, Morse phrases, compass bearings, K1/K2/K3 misspellings, YAHR) mapped to its specific solve function on the solution page.
• Glossary expanded: 12 new terms including f value, g value, control card, master constants, binary gate, YAR/RAY disambiguation, Weltzeituhr, Mengenlehreuhr, K5, on-site solvability, bridge rule, helper strip.
• Navigation updated: Field Guide added to header, sitemap, breadcrumbs, and all continue-nav sections across all pages.
• All ambiguity resolved: The running ambiguity ledger shows all items green. No yellow or red items remain.

• Mechanism declared closed: R = (C − P) mod 26 holds at all 97 positions. r + gate = R holds at all 97 positions. Gate = 1 where the packet-phase rule yields 1. Lane = ((i − 2) mod 14) + 1 holds at all 97 positions. These are verified relationships, not proposed ones.
• Equivalent representations confirmed: Direct R lookup and r+gate decomposition produce identical results at all 97 positions and are documented as equivalent representations of the same verified shift.
• Berlin role clarified: BERLIN (positions 64–69) and CLOCK (positions 70–74) remain confirmed adjacent anchors. The formulas define the mechanism.
• 24-sector arithmetic claims removed across all pages.
• Encoding-layer claims eliminated: R is now stated explicitly as not encoded: no hidden secondary layer, affine residual, Berlin-clock residual, or second unknown key is required.
• Orientation calibration documented geometrically.
• Physical layer formalized: Ciphertext face fixes stream order; tableau face fixes column indexing discipline; orientation cues prevent lane drift.
• Open question bounded: The origin of r is identified as the open provenance question.

This update reflects the transition from mechanism-as-analogy to mechanism-as-formula. No new plaintext claims were introduced.

• Selector + accumulator model stabilized: The Berlin Clock reference was formalized as a dual methodological cue — the Berlin World Clock (24-sector stance selector) and the Berlin Set Theory Clock (set-sum accumulator).
• Boundary-state clarification: The role of X within the reconstructed plaintext was documented as part of the output itself, aligning with seam-adjacent and ray-start boundary behavior under the 7×14 column model.
• Cross-page consistency pass completed: Updated all content pages to reflect unified terminology and mechanism framing.
• Publication posture strengthened: Clarified falsifiability criteria and separated structural claims from interpretive layers.

Attribution: The full-span K4 plaintext reconstruction and mechanism were resolved and documented by Matt Lacy, independent cryptanalysis researcher and IT professional, Austinburg, Ohio.

• Constraint vs. order formalized: Explicitly separated what the sculpture constrains (orientation, boundaries, mechanism class) from what it intentionally withholds (the final traversal/ordering rule).
• Physical clue inventory completed: Updated the on-site walkthrough to surface all materially relevant sculptural cues, including directional reversals (YAR/RAY), turn behavior, and consistent structural break markers.
• Berlin Clock role locked: Clarified that the Berlin Set Theory Clock supplies a computation model, not navigation, traversal, or geographic instruction.
• Method page stabilized: Finalized K4 framing as a constrained mechanical system rather than a keyword-based cipher.
• Solution presentation finalized: Published the proposed K4 plaintext with artist-confirmed anchors preserved exactly.
• Verification posture strengthened: Confirmed falsifiability criteria and bounded remaining uncertainty to the absence of a public traversal chart.

This update marks the transition from iterative exploration to a publication-ready state.

• Sculpture-first framing: Reoriented the site to begin with the physical installation — courtyard context, materials, and spatial behavior — before moving into technical analysis.
• Context expanded: Clarified the resolved structure of K1–K3 and highlighted how K4 differs in method, constraints, and interpretive demands.
• Clue sections established: Introduced dedicated sections for the Morse inscriptions, compass rose behavior, Berlin Clock reference, and alphabet/row mechanics.

• Full K4 plaintext string stabilized for the first time, preserving all artist-confirmed anchors and producing a coherent end-to-end instruction.
• Resolution precedes proof: At this stage, the plaintext existed as a working result prior to a fully articulated traversal or ordering explanation.
• Focus shifted to validation: Subsequent work concentrated on mechanism modeling, constraint analysis, and identifying what information the sculpture provides versus what it withholds.

Attribution: The stabilized full-span plaintext reconstruction was first identified and documented by Matt Lacy, independent cryptanalysis researcher and IT professional, Austinburg, Ohio. Later entries formalize the mechanism that produces this result.