TITLE
Lumen — Municipal Power Board, Pop. 2,140

PROMPT
A dashboard for the electricity grid of a tiny fictional town, "Lumen", drawn as an isometric toy model in SVG: little houses, a bakery, a school, a tram, a cinema, a windmill ridge, a solar field, a small hydro dam and a battery barn, all wired together with visible lines along which power visibly flows. The data (clearly fictional) is simulated in the page over a 24-hour day; the dashboard's charts and the model town are two views of the same simulation. Concept: an infrastructure dashboard with the charm of a model railway.

Mood: cheerful, tidy, civic-minded; a town that is proud of its substation. Palette: warm paper white #F6F1EA ground, blush pink #F9C5D1, pale aqua #A8DADC, steel blue #457B9D, sunflower yellow #FFD166 (electricity, lit windows, highlights), ink navy #2B2D42 for outlines and type. Pastel, light, flat isometric shading (each building: top face lightest, left mid, right darkest of one hue), thin navy outlines, no gradients, no glow except the yellow of lit windows at night.

The town (isometric SVG, 30° grid, about 30 buildings in five districts on a diamond-shaped base with a river crossing it): Old Town (terraced houses, the bakery with a chimney that works from 3 a.m., the clock tower showing simulation time), Millside (workshops, the laundry, a small factory with saw-tooth roof), Hilltop (school, library, the cinema "The Bijou" with a marquee that lights at dusk), Riverside (allotments, pump house, tram depot; a single tram trundles a loop and draws power while moving), and the Works (substation with tiny transformers, battery barn). Generation: three wind turbines on the ridge (blades rotate according to wind speed), a solar field (panels brighten with the sun; a cloud shadow crossing reduces output), the hydro dam (steady, with a sluice animation), and the interconnector pylon line leading off the board to "the mainland" for import/export.

Simulation: time runs at 1 simulated hour per ~6 real seconds (adjustable, and scrubbing via a day dial); demand curve per district with morning and evening peaks, the bakery's night shift, school hours, cinema evenings, tram schedule; supply from sun (bell curve with passing clouds), wind (smooth noise), hydro (flat), battery (charges on surplus, discharges on deficit, with state of charge), import/export balancing the rest. Day–night lighting: the board's ground tint shifts from morning cream through noon white to dusk pink and night navy-blue tint (kept pastel: a dim lavender, not black), windows light up yellow house by house at dusk and go dark at bedtime, streetlamps come on.

Signature moment: power flow. Along every wire (thin navy lines on little poles and underground dashed runs), small yellow dashes travel in the direction of flow at a speed and density proportional to the kilowatts on that line; lines reverse direction when the battery switches from charging to discharging or when the town starts exporting; thick trunk lines from generation to the substation pulse. When the evening peak hits and the wind drops, the viewer watches the battery barn's flow reverse and the interconnector begin importing. Clicking any building or generator selects it: it lifts slightly, its wire highlights, and a small card shows its live draw/output, today's energy, and one human detail ("No. 14 Tanner Row: 0.4 kW. Kettle. Again.").

Dashboard panels (arranged around/below the model on desktop; stacked on phones; drawn in the same pastel flat style with navy hairlines): a big stacked area chart of the last 24 hours of supply by source against the demand line, with the "now" line advancing; a frequency gauge (50.00 Hz with a needle that wobbles within ±0.05 and dips when a big load switches on); battery state-of-charge as a segmented battery icon with hours remaining; today's mix as a ring ("71% from the hill and the sky"); carbon-free streak counter in hours; import/export tally in pounds, "sold to the mainland: £38.20"; a ticker of events ("17:42 The Bijou's marquee is on. 3.1 kW of civic pride.").

Interaction: toggles per district as little knife switches on a drawn switchboard (flip one and that district blacks out: windows dark, a tiny "!" over the bakery, demand drops, the event log grumbles; flip it back); weather controls: wind dial and cloud slider that the viewer can override; "storm" button that trips the interconnector so the town must island on its own generation (load shedding by priority if needed, with the cinema going dark first and the bakery last); a day dial to scrub time; speed ×1/×4/×16; "tonight's big match" event button that creates a half-time kettle surge.

Typography: friendly municipal: headings in a rounded or geometric sans (Futura/"Century Gothic"/"Avenir Next"/"Trebuchet MS"), bold, navy, with the town crest (a lightbulb in a shield, SVG); figures in tabular numerals, large; small labels in tracked caps; district names lettered on the board itself in isometric perspective (skewed text along the grid). Entrance: the board is empty for an instant, then buildings pop up district by district with a springy rise (staggered 25ms, overshoot), wires string themselves between poles, and the yellow dashes start to run: the first three seconds. Reduced motion: buildings appear at once, flow shown as static arrows on wires, time advances in steps. Keyboard: the model is a single tab stop with arrow keys moving between buildings in logical district order (Enter reads the meter, Escape closes it); switches, dials and buttons are focusable, all with navy-and-yellow focus rings. Performance: SVG dashes driven by one inherited stroke-dashoffset per wire (three phase-shifted dash layers fade in as the kilowatts rise), CSS animation for pulses, ripples, sluice and steam; pause when hidden.

DESCRIPTION
Lumen is a municipal power dashboard built as a model-railway board: an isometric pastel town of some thirty buildings on a steel-blue plinth, with a wind ridge, a sun field, a weir, a battery barn and a pylon line to the mainland, all wired to a tiny substation. One simulation of a 24-hour day drives both the model and the instruments around it. The board opens empty, buildings spring up district by district, wires string themselves between poles, and yellow dashes begin to run along them at a speed and density that match the kilowatts on each line. As dusk falls the board tints from cream through pink to a dim lavender, windows light house by house, the Bijou's marquee comes on, the wind drops, and the viewer watches the battery barn's flow turn round and the interconnector start importing. Around the model sit a day dial, frequency gauge, segmented battery, a 24-hour stacked supply chart with the demand line, today's mix ring, a carbon-free streak, the mainland account in pounds and a dryly written event log, all in the same flat navy-outlined style.

VISUAL TECHNIQUES
- Isometric SVG scene generated from a 24 by 24 grid with a 30 degree projection; every building built from three-tone flat faces (top lightest, left mid, right darkest) with thin navy outlines
- Painter's-algorithm depth sorting, with the moving tram re-inserted into the sort order as it circles its loop
- Ground plane drawn in grid units through a single isometric matrix, including district names lettered flat on the board and plaque text on the plinth faces
- Power flow as layered dash strokes on each wire: one inherited stroke-dashoffset per wire, three phase-shifted dash layers whose opacity encodes load, navy keylines under yellow dashes, smooth reversal through zero
- Day and night lighting by a full-board multiply overlay interpolated through cream, white, dusk pink and lavender, with lit windows, lamps, marquee and flow drawn above it so only the yellow glows
- Springy staggered entrance (custom overshoot bezier) and wires that draw themselves by dash length
- Deterministic value-noise weather, bell-curve sun, per-building load schedules, battery state of charge, import and export balancing, priority load shedding when islanded
- Second-order spring frequency needle that dips on load steps, a segmented battery, a dash-array donut, and a stacked area chart with a travelling now-line and a veiled yesterday
- CSS-animated river ripples, sluice water, bakery smoke, laundry steam, storm rain and a lightning flash
- Hand-drawn SVG controls: knife switches with a sprung blade, a rotary wind knob, a cloud-shaped slider thumb, chunky push buttons, a sun-and-moon day dial

INTERACTION MODEL
Click or tap any building, generator, the tram or the mainland breaker to select it: it lifts, its feeder back to the substation highlights in yellow, and a meter card shows its live kilowatts, today's energy and one human detail; with the keyboard, the model is one tab stop and the arrow keys walk the buildings in district order, Enter reads a meter and Escape closes it. Drag the sun round the day dial (or use arrow keys) to scrub time, with the simulation fast-forwarding to the chosen hour; choose speed x1, x4 or x16. On the switchboard, flip a knife switch to isolate a district: its windows go dark, a "!" appears over its landmark, demand drops, the frequency needle kicks and the log grumbles; flip it back to restore. Turn the wind knob or slide the cloud to take over the weather, and press the Forecast button to hand it back. The Storm button trips the interconnector and feathers the turbines so the town islands on weir, sun and battery, shedding loads in priority order from the cinema first to the bakery last and restoring them as power allows; pressing again recloses the line. "Tonight's big match" kicks off a game whose half-time and full-time whistles send a kettle surge through every home. With reduced motion, buildings appear at once, flow is shown as static arrows on the wires and time advances in steps.