Enigma I
AAAAA to BDZGO, reproduced
Wiring, notches and stepping are simulated and must match the published tests, including the middle rotor's double step. In the viewer you type on your keyboard.
Rubik's Cube
20-move superflip, reproduced
26 pieces that really turn, no tables. The model flips all 12 edges in the published 20 moves, comes back after 1,260 repeats of the longest sequence, and counts 43,252,003,274,489,856,000 positions.
Honda K20A
1,998 cc and 1-3-4-2, checked; rod is a guess
A real crank-slider: 16 valves, cams placed from the valve windows. Displacement is computed from bore and stroke, and the published firing order must be possible with the crank. Honda does not publish the rod, so it is dashed.
GeForce RTX 4090
6 figures checked; the inside is a guess
82.58 TFLOPS, 1,290 Gtex/s, 1,008 GB/s and 24 GB are each computed from the published cores, clocks, bus and data rate. Every variable carries its source, so the estimated memory packages show in another colour. The inside of the card is not published and is dashed.
MOS 6502
64 KB, 105 opcodes, 16.6 mm2, checked
Two sources have to agree. The gate counts the address and data pins on the pinout and compares them with the published bus widths, and measures the drawn leads against the DIP standard: 2.54 mm pitch, 15.24 mm rows.
React: what a click does
1 of 8 DOM nodes touched
Software in motion. A Counter component, its output before and after a click, and the real page. A model written from React's published rules has to predict what the real React 18.3.1 touches: one text, 7 nodes left alone, nothing rebuilt. Measured with a MutationObserver.
Pin tumbler lock
14 figures reproduced
A lock cut open, with a real KW1 key. The published table says pin plus cut depth is .501 in for all six heights and the plug is .498 in: the model has to agree, the right key has to put all five splits on the shear line, and a key with one cut three steps off has to leave a pin across it. The key is a polygon with V cuts and the pins ride on its roots.
WinRAR unpacking
49 bytes in, 119 characters out
The three-book icon, doing its job. WinRAR packed a text into 49 bytes; a decoder written only from RFC 1951 reads them token by token and writes the text back. The CRC-32 has to be the one WinRAR stored, and two independent decoders (Node zlib and WinRAR itself) have to agree.
RAR5 archive bytes
87 bytes, rebuilt identical
Software, taken apart: the 87 bytes WinRAR 7.23 writes for one small file. A model written from the published format has to reproduce them byte for byte, and the real UnRAR has to accept and extract the archive the model built. Change one byte and the gate fails.
Three-speed hub
0.75 / 1.00 / 1.333, matches
A planetary stage with the sun fixed. The running model gives the ratios the maker publishes as 75, 100 and 133 %. Tooth counts are derived; sizes are estimated and dashed.
Cherry MX2A Red
published forces are not linear
A press, not gears. The datasheet's three force points cannot come from one linear spring, and the film plots that instead of hiding it.
Galaxy S25 Ultra vs S26 Ultra
Measured on official renders
Five separate lens rings against one pill, titanium against aluminum, corners of 5.6 against 7 mm. Interiors are not drawn: no readable photo, and the film says so.
POCO X8 Pro Max vs S26 Ultra
Interior measured
Lenses, island and corners measured on official photos, and the POCO's interior measured on the maker's own spare-parts photos.
Raspberry Pi 4 Model B
Viewer
Every outline traced from the official datasheet drawing, the pinout from its figure 3.
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