Four ancient cities emerge from flowing ink on rice paper

2x2 grid, do this for 4 historical cities: 16:9 void main() {     string subject = "[$SUBJECT]";          // Flow Field Advection     vec2 force = vec2(         sin(uv.y * 20.0 + u_time),          cos(uv.x * 20.0 + u_time)     );     vec2 distorted_uv = uv + force * 0.02;          // Fractal Brownian Motion (Turbulence)     float turbulence = 0.0;     float amp = 1.0;     for(int i=0; i<6; i++) {         turbulence += amp * noise(distorted_uv * pow(2.0, float(i)));         amp *= 0.5;     }          // Ink density threshold     float ink_density = smoothstep(0.4, 0.6, turbulence * subject_mask(subject));          // Paper texture synthesis     float paper_grain = noise(uv * 500.0) * 0.3;          vec3 ink = vec3(0.1, 0.1, 0.15);     vec3 rice_paper = vec3(0.95, 0.93, 0.88);          render_color = mix(rice_paper, ink, ink_density) + paper_grain; }

Compiled: 

Create a 16:9 image in a 2x2 grid, featuring four historical cities as elegant ink-wash landscape studies on textured rice paper.

Each panel should depict one historically significant city, such as Rome, Constantinople, Angkor, and Machu Picchu, interpreted through a flowing procedural ink style.

The image should feel like a blend of:
 ancient travel manuscript, East Asian ink wash painting, archaeological illustration, and historical atlas plate.
Use a visual effect where the city silhouette appears to be formed from turbulent ink spreading across paper. Buildings, temples, walls, mountains, rivers, ruins, and monuments should emerge from layered black ink density rather than hard outlines.

Visual rules:

Flowing ink distortion, as if the scene is being shaped by invisible currents.

Fractal turbulence creates organic variation in the city forms.
Dense ink areas define architecture and shadows.
Lighter ink washes define atmosphere, mountains, water, and distance.
Visible rice-paper grain throughout the entire image.
Palette: warm ivory paper, charcoal-black ink, subtle grey wash.
No modern color, no glossy realism, no digital neon.
Each city should have a handwritten title and small historical subtitle.
Add small red seal stamps or archival marks for authenticity.
The whole composition should feel handcrafted, aged, and museum-worthy.
Suggested four panels:

ROME — ancient imperial skyline, Colosseum, aqueducts, temples, Tiber River, circa 2nd century CE.

CONSTANTINOPLE — Byzantine domes, Hagia Sophia, harbor, city walls, ships on the Bosphorus, circa 6th century CE.
ANGKOR — temple towers, jungle canopy, reflecting water, carved stone causeways, circa 12th century CE.
MACHU PICCHU — Inca terraces, mountain ridges, stone citadel, misty Andes, circa 15th century CE.
Final style:
A refined historical ink-wash collage, 2x2 grid, textured rice paper, turbulent procedural ink, archaeological atmosphere, soft monochrome, elegant hand-drawn titles, cinematic but minimal.