Scratchboard engraving shows black ivory fields with flowing lines

2x2 grid, 16:9, pick 4 hardest decades INPUT: $ TOPIC
// Semantic inference from topic
DOMINANT = infer_dominant_scale_object($ TOPIC)    // the topic's largest symbolic form
LIGHT = infer_primary_light_source($ TOPIC)        // sun equivalent
SECONDARIES = infer_secondary_bodies($ TOPIC, count=2)
FIELD = infer_flow_theme($ TOPIC)                  // what the sky/background represents
GROUND = infer_ground_element($ TOPIC)             // grassland equivalent
VEGETATION = infer_ground_vegetation($ TOPIC)      // shrubs / trees / stalks equivalent
HORIZON_OPEN = infer_open_center_rule($ TOPIC)
FIGURES = infer_foreground_figures($ TOPIC, count=2)
SHADOW = infer_shadow_direction_and_tension($ TOPIC)

// Build a scratchboard potential field Φ across the square.
Φ = flow_field(FIELD) + mass_gravity(DOMINANT) + ground_curvature(GROUND)
F = ∇Φ       // incision line direction across the entire surface
Curl = ∇×Φ   // nested contours, whorls, teardrops, marbled eddies
Div = ∇·F    // line density variation: fine detail vs open black

// COMPOSITION:
// - Sky/upper field: upper ~2/3
// - Ground: lower ~1/3
// - Horizon: ~67% height
// - DOMINANT placed left-half, sized ~29% canvas width
// - LIGHT placed upper-right quadrant
// - SECONDARIES placed above-right and mid-right
// - FIGURES placed lower-left foreground, tiny
// - Shadows stretch diagonally toward bottom-left

// RENDERING:
// - Begin with nearly black surface.
// - Describe everything with fine ivory-white incised lines.
// - Dense hatching, nested contours, tiny scratches, alternating black/white ribbons.
// - All shading through line density and thickness, no gradients.
// - DOMINANT surface: convoluted fingerprint-like markings; illuminated upper-right, black lower-left.
// - FIELD: flowing irregular contour bands around all bodies; bend around LIGHT.
// - LIGHT: small intensely white core, feathery scratched edge, rays merge into field.
// - SECONDARIES: fine engraved surface, pale rims, dark interiors.
// - GROUND: undulating, thousand slender strokes, alternating crest/hollow.
// - VEGETATION: rounded clusters, branching white trunks, scratched foliage edges.
// - Center horizon kept relatively open.
// - FIGURES: tiny silhouettes, long sharp diagonal shadows through hatched ground.

// FINISH:
// - Strictly black and ivory-white. No color, no gradient, no blur.
// - Square, edge-to-edge fill. No border, text, or signature.
Render 8K scratchboard engraving.