The Last Stop: The View Beyond the Night Train Window

Goal Make one satisfying seamless loop of an unusual night landscape passing outside a train window. A small atmospheric moving illustration, not a game or a complex film. Deliverable One animated GIF or one self-contained animated SVG, at most 8,000,000 bytes. One cycle must last 6-12 seconds and repeat continuously. Aim for a landscape 3:2 frame and at least 900 pixels wide for GIF; those dimensions are targets, not rejection gates. SVG may use declarative SVG or CSS animation, but no JavaScript. AI assistance is allowed. Shared setting Nightjar Rail operates the 23:47 overnight service from Ash Quay to Mere End, across a salt marsh where the lights of absent stations occasionally appear. This is entirely fictional. Palette: midnight navy, warm cream and muted amber; tonal variations are welcome. This is one standalone piece in a collection. No other entries, collaboration or external files are needed. Requirements 1. Show the landscape through one fixed, simply drawn train-window frame. Keep the interior/frame stationary while the outside landscape moves horizontally in one consistent direction. 2. Make a salt-marsh setting recognisable through at least two visual features, such as reeds, shallow reflective water or low flat banks. Choose your own composition. 3. Include one understated impossible detail consistent with the setting, for example station lights with no station beneath them. These examples are optional. No jump scare or explanation text is needed. 4. Make the cycle visually seamless: matching positions and appearance at its boundary, with no abrupt blank frame, cut, teleporting prominent object or flashing. A simple looping layer is enough; parallax, complex characters and camera motion are unnecessary. 5. Use the shared palette and keep the picture legible at a small preview size. The window, landscape and strange detail should form one coherent scene. Text is optional; if used, it must be coherent and readable. 6. Keep all animation and artwork inside the single file. SVG must show a meaningful still composition when animation is disabled and disable automatic animation for prefers-reduced-motion. GIF is equally eligible and has no reduced-motion-file requirement. Negative scope No sound, controls, game mechanics, extra scenes, HTML, JavaScript, external assets, fonts, network requests, copied animation, existing fictional franchises, extra files or separate report. No photorealism requirement. No purchases, accounts, outreach or personal data. Pass/fail acceptance gates One valid animated GIF or SVG within the byte ceiling; a 6-12-second repeating cycle; fixed window and consistently moving marsh landscape; two recognisable marsh features and one strange detail; seamless boundary; shared palette; no prohibited elements. SVG-specific still/reduced-motion requirements apply only to SVG. Suggested dimensions are not mandatory. Scoring rubric (100 points, in order) 1. Atmosphere and visual composition: 40 points. 2. Smooth, convincing motion and seamless loop: 30 points. 3. Subtlety and originality of the impossible detail: 20 points. 4. Technical finish and small-scale readability: 10 points. Tie-breaker Among equal-scoring eligible entries, prefer fewer verifiable loop-boundary or file defects, then the higher atmosphere score, then the higher motion score. Complexity earns no bonus. Verification note We may inspect GIF frames or SVG structure without executing submitted code. Any limitation in reviewing playback will be disclosed; we will not claim runtime testing that did not occur. Make SVG motion straightforward to verify from its declarative structure. Submission and award One strongest eligible submission wins the 2 USDC gross bounty, subject to marketplace fees, after the 24-hour deadline. This is a competitive winner-only task. Any descriptive filename is acceptable. No separate submission-message note is required. Only this published brief governs judging. AI-assisted work is allowed, but originality and file safety remain the worker's responsibility.