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SENKAI-42 旋回

Geometric composition instrumentImage → System → Mark

Front view of the powered-on SENKAI-42 instrument, showing its green CRT and physical controls — SENKAI42_MACHINE_PUBLIC_01

01 / Instrument record

SENKAI-42 sits somewhere between drawing software and an electronic instrument. Geometry is generated deterministically, but selected relationships remain playable. The intended endpoint isn't a screen image. It's a physical drawing executed by pens.

PRINT EDITION / STATUSSENKAI-42 PRINTS ARE CURRENTLY NOT AVAILABLE

SENKAI-42 / 旋回

Program card: 0001
Voice 01: FACET / PLANE
Voice 02: INTERFERENCE / LATTICE
Seed: 42173806
Ink bank: K / C / M / Y
Output: CANONICAL SVG / MM

Output / 03 records

Visual territories

Vertical composition of interlocking cyan, magenta, yellow and black folded planes with directional lines, hatching and scattered ink-like texture — **Approved source artwork / Raster**
FACET / PLANE — Long Fold / Interlock. A vertical CMYK folded-plane composition built from interlocking ribbon structures, transparent overlaps, directional line fields, selective hatching, and scattered ink texture.

Square composition of overlapping transparent cyan, magenta, yellow and black geometric planes — **Approved source artwork / Raster**
INTERFERENCE / LATTICE. Layered transparent geometric systems using repeated planes, optical overlap, density changes, and interference relationships.

Vertical composition of overlapping coloured orbital forms, fine black vertical lines and open space — **Approved source artwork / Raster**
CIRCLE / ORBIT. Asymmetric overlapping orbital/circular systems with vertical line structure, CMYK interaction, and controlled negative space.

Source studies, deterministic vector reconstructions, plot-feasible Ink Results and physical plots are separate records. A source study does not document a completed pen drawing.

Machine archive

Archive record

Identification, controls and acquisition material. Documentation remains incomplete.

Close documentation view of the SENKAI-42 identification plate, CRT and controls — SENKAI42_MACHINE_DETAIL_01

Acquisition record

Akihabara / 05 fragments

THE SHOP

I found it in Tokyo, a few streets away from the parts shops I knew in Akihabara. The place wasn't really a shop, or at least didn't look like one from outside. Meters, cables and old test equipment were stacked almost to the ceiling. SENKAI-42 was sitting sideways on a lower shelf near the back.

Interior of the electronics shop near Akihabara associated with the SENKAI-42 acquisition record. — ACQ—01

THE LABEL

There wasn't much on it that I could read. A small plate said SENKAI-42. Underneath was 旋回. Most of the other markings looked functional rather than descriptive. The man in the shop didn't have a manual. Or couldn't find one. I'm no longer certain which.

BUYING IT

I asked what it did. The answer involved a gesture toward the screen and then toward a small plotter sitting under a cloth. I understood almost none of the explanation. The price was written on a piece of paper. It was low enough that asking more questions seemed unnecessary.

Purchase documentation associated with the SENKAI-42 acquisition record. — ACQ—03

LOOSE MATERIAL

There were a few loose things with it: a cable I couldn't identify, two cards, and a folded service sheet. None explained the machine particularly well. One card had numbers written over the printed fields in pencil. I've kept them exactly as I found them.

SENKAI-42 service and inspection paperwork with calibration cards and handwritten notes. — ACQ—04

FIRST POWER

I didn't power it on in Japan. Back home, I spent more time checking the supply than I did cleaning it. The CRT came up slowly. A few labels on the screen matched the controls on the panel. FACET was one of them. INTERFERENCE was another. That was enough to start.

Powered-on SENKAI-42 machine showing its green CRT and physical controls. — ACQ—05

Material found with unit

05 annotations

01
Two cards were loose inside the case. Neither is labelled as software. One has pencil marks beside three printed fields. I haven't erased them.
02
The service sheet uses SENKAI-42 once, at the top. Most of the remaining text appears to be calibration and inspection information. No manufacturer name is obvious.
03
There is a second number stamped into the rear chassis. It doesn't match the number written on the service card. I don't know which, if either, is the serial.
04
One card produces a repeatable geometry when the same state is restored. Changing the seed changes some structures and leaves others untouched. I'm still documenting which controls belong to which behaviour.
05
The word FACET appears both on the front panel and in the CRT menus. INTERFERENCE does too. Those were the first two labels that made the machine's purpose slightly less opaque.