Each depth is a frame. Two lines: packed-flat (same bits, always) and deflate (the fold's doing). Depth 3 was padding.
Different door from regime flipbook. This one folds the plane accordion-style and stacks the frames. Palette: black / blue / yellow / red for fold 1, then the rest. foldpack.py stays the CLI (PNG in). This page folds any dropped bytes or published SEED0.
AUTOFAB0 accordion (cite 07, not reminted): fold 1 92.12% · 2 65.30% · 3 51.75% · 6 44.20% · 7 39.20% · 8 34.41% · 9 32.49% · 11 30.23% = 5,740 B. Packed size stayed flat. The fake sweet spot at depth 3 was whole-byte padding.
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