Art Nouveau is usually described as a look — whiplash curves, elongated women, flowers. Described that way, it reduces to a decorated border wrapped around an ordinary picture. We know because we built that version first: a correct Mucha frame, peacock eyes and whiplash cartouches included, around panels of cel-shaded fantasy illustration — zero Nouveau inside the picture plane. The style on this page is the rebuild, and its governing sentence is the corrective: build every panel interior the way the border is built.
What evidence the Art Nouveau style is built on
We measured the tradition instead of describing it: twenty-nine candidate artworks collected and validated across three research rounds, of which fifteen survived as first-class evidence — fourteen separate works, since two files are the same sheet at two scales — while seven were kept as scoped witnesses and seven were rejected with written reasons. The rules that came out of the plates are the rules the generator is instructed to obey:
- The contour is often not black — and sometimes not drawn at all. Three period regimes: Mucha's warm brown-violet crayon keyline; a fully coloured contour (our reference plate has no black anywhere in the figure — the hair is closed in red-orange, the flesh in pink-red); and a channel of bare paper reserved between two ink fields, a keyline made of light. Black keylines do exist here — Grasset's wing draws in one — but the poster line swells, thick at the belly of a curve and hairline at both ends, rather than running at uniform width.
- Flat means no ramp, not no tint. One of the flattest cheeks in the evidence base — Grasset's La Vitrioleuse, on the file we ship — varies by just two grey levels across a tight patch, and Mucha's faces stay within a spread of thirteen to thirty-six inside a single field. Sheets outside the flat register read higher on the same kind of patch: a rejected 1897 sheet at 77, and Toorop's crayon-modelled Delftsche Slaolie, kept as a witness for its ornament field but not for its surface, at 130 — smooth ramps describing a curved surface, which is exactly what the style refuses. The working rule is one flat ink per field plus at most one darker flat step of the same hue.
- The halo is the lighting system. A pale disc behind a focal head is lighter than both the head and the field around the disc — on the reference plate its bare paper measures a mean of 223 against surrounding greens averaging about 160, a spotlight manufactured with no light source anywhere in the picture. The disc is not always pale: Privat-Livemont's Bitter Oriental of 1897 sets a saturated red disc that reads darker than the face in front of it, and cuts head from disc with a reserved channel of bare paper while a cream robe carries the value. The general form is that the head must separate from its disc by value or by a reserved channel.
- Weather is a named unit plus a repeat. Snow is four or five lobed cloud-shapes reused at different scales; vapour is one lobed ribbon stacked up a column; sunlight is one wavy band repeated concentrically. The tradition never renders a phenomenon — it builds one out of ornament.
- The date boundary is a construction rule. From about 1899, Mucha's own Champenois heads turn photographic — modelled sockets, ramped nose shadows. A rejected sheet dated 1897 already prints in that register, which is why the style tests construction, never the year on the label.
The reference plate: Henri Privat-Livemont, Absinthe Robette (1896), Library of Congress, public domain. No black anywhere in the figure, and the disc behind the head measures 223 against greens near 160 — some 63 grey levels lighter than the ground it sits on, and lighter than the head in front of it.
How a chess game reads in Art Nouveau
The Mucha panel is not a scene containing a figure; it is a figure standing on a decorated field. That staging system maps onto a chess comic with almost no translation. The pale disc is an emphasis engine: whichever piece owns the move owns the halo, so a queen raid or a king hunt reads as a sequence of decorative panels — panneaux — each with its protagonist lit by value rather than by lamplight. Two pieces in confrontation stage the way the tradition staged its two-figure sheets — near-equal scale, one overlapping the other, never receding. A tactical burst is a fan of flat straight rays; rain over a losing position is one whiplash strand repeated in columns; the board's own geometry feeds the back-planes, since a mosaic of small tiles or an all-over lozenge lattice is how this style writes shadow anyway. And because every rule is about contour, field and plane — never about costume or architecture — any world's cast survives the treatment: knights, wizards and grandmasters keep their wardrobe and gain a swelling keyline.
The bar an Art Nouveau page has to clear
Here is the bar itself — ten of the things we look for when we calibrate this style and when we audit its pages, and the last step of the four-step method behind every Chess2Story comic style.
- The ramp gate, the load-bearing one. Patches sampled inside a colour field must read flat, or as two flat steps meeting at an edge, never as a smooth ramp. Every measured keep reads at or below 36 grey levels inside a field — the flattest, Grasset's, at two on the file we ship; the gate itself sits at 45.
- The halo gate. The disc behind a focal head must be lighter than both the head and the field around the disc.
- Contour colour. A contour whose pixels are nearly all neutral black fails: the tradition's line is as often warm brown-violet, hue-matched to its own field, or a reserved channel of bare paper.
- Contour swell. The line must run at least 1.8 times thicker at its thickest tenth than at its thinnest. A constant-width outline is not Nouveau.
- The paper-white ceiling. The brightest large field must be a warm ivory, never pure white.
- The palette lock. Grey-blue may never be the dominant colour of a panel.
- The repeat count. A declared weather event must resolve into two to nine copies of one named unit: none means the phenomenon was rendered rather than built, more than nine means the unit has become a texture.
- The face audit. Count the marks: any nasolabial fold, eye bag, modelled eye socket, ramped nose side, specular eye dot or painted-on hair highlight is a fail; a single cheek tint step, hard-edged or spattered, passes.
- The hair audit. Flat fields with interior current-lines and free scroll terminals pass; individually rendered strands fail.
- The masked-border test, the decisive one. Cover the border, and the picture must still read as Art Nouveau.
These are a calibration and audit checklist a person applies to the style — not software inspecting your particular page; the only checks that run on every page are the lettering and artifact passes, and what those read is the words, not the letterforms. The letterforms are a standing instruction to the drawing: hand-drawn display capitals in flat solid colour, housed in a whiplash cartouche or set into a lintel or arch. The tradition never drew a speech balloon, so ours is an invention built out of its cartouche: a thin keyline at the panel's own contour weight and hue, black only when the panel's contour is black. The same instruction covers sound effects — flat display capitals, no outline and no glow.
The result is a comic that feels like it was pulled off a Brussels lithography stone in 1896 — a printed decorative object with your game inside it.
