Scroll your way through the projects closest to my heart. There are many more on GitHub.

There is a story behind every one of these projects – one that inspired me, or that simply stayed with me as a warm memory.

TOON: A Data Format for Language Models

Spec, Implementations, Paper (2025–2026)

TOON infographic: "Compact, human-readable serialization of JSON data for LLM prompts", a JSON to TOON to LLM workflow, a tabular example, and accuracy per 1K tokens at the bottom – 29.2 for TOON versus 16.6 for JSON.
Header of the IEEE Access research article "A Comprehensive Empirical Evaluation of Token-Oriented Object Notation (TOON) for Large Language Model Applications" with the five author names and the beginning of the abstract.
Title page of the IEEE Access paper "A Comprehensive Empirical Evaluation of Token-Oriented Object Notation (TOON) for Large Language Model Applications", with abstract, five author names, and a July 2026 publication date.
Page of the paper explaining TOON: a diagram of the pipeline from JSON through TOON to the language model, the same object side by side as JSON and as TOON, and an example of the tabular form at 22,250 versus 9,120 tokens.
Results page of the paper with four charts: overall accuracy by format with TOON leading at 73.9%, accuracy by model, the distribution of the 209 questions across five categories, and accuracy by question type.
Page of the paper with the validation accuracy table, a chart of token consumption by format, and a heatmap showing per dataset where TOON saves tokens and where it costs them.
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Finanzfluss Summer Days

Event Photography (2025)

Two people on a raised terrace above the garden and pool, the Atlas mountains on the horizon.
Group working and chatting on floor cushions and rugs in the shade of a large Berber tent.
Two people standing at a table with a laptop, the garden and pool with loungers and parasols behind them.
Person in a blue robe and turban on a camel, the sun setting over the stony desert behind them.
Long red-clothed table with laptops inside a villa; through the open glass doors, more people are working outside.
Person sitting on an ATV in the stony desert, leaning on the handlebars; more ATVs lined up behind.
Group having dinner on a rooftop terrace above the roofs of Marrakech, the Koutoubia minaret on the horizon.
Workshop with laptops at U-shaped tables facing a projector screen.
Long table at night in front of the lit villa, string lights above; in the foreground the pool with reflections and floating candles.
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Pixel Postcards from Stube Umlauts

25 Motifs for Self-Printing – Freely Licensed

Hand-drawn logo: two portrait heads – one with a black fringe, one with glasses – and the handwritten lettering “Stube Umlauts” on cream
Green pixel caterpillar beside a small cake with a cherry, with the lines “Ich bin so satt, ich mag kein Bla…” and “Oh, Kuchen!”
Yellow pixel creature with red cheeks and black ear tips, framed by the lines “Du bist” and “super effektiv!”
Postcard with a long-bodied pixel dog next to a brown pile of poop, lettering below reading “OK WAU”
Greeting card text “Alles Gute nachträglich!” with a pixel frog and the line “Sorry, war im Teich.”
Sitting orange pixel cat, with the lettering “CIAO MIAU” below
A pixel snowman labelled “Schneemann”, below it the same pixels neatly sorted into groups, labelled “Schneemann, aufgeräumt”
Red pixel crab looking up at a red balloon drifting away, with the words “Oh Crab” below
Teal, boxy pixel elephant above scattered colourful confetti and the handwritten word “elefantastisch”
Pixel character with a red cap, moustache and blue dungarees, above the line “THAT’S-A SO NICE!”
Small pixel pig with the word “GUTSCHWEIN”
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Premium Plugins for Kirby CMS

Digital Products (Since 2024)

Promo graphic for “Kirby Copilot” showing an AI content generation interface
Promo graphic “Kirby Content Translator – Translate your content with DeepL, in the Panel or via CLI commands” with the Panel translation dialog
Promo graphic for “Kirby SEO Audit” showing an audit report panel on a dark green background
Promo graphic for “Kirby Live Preview” showing a CMS preview interface and a page preview
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Wantalon: Curated Art Tours

Mobile App (since 2022)

Wantalon branding — abstract green fingerprint graphic on a dark background
Wantalon home screen with an interactive map showing numbered art stations and a list of available parcours
Parcours detail card for “Dekadensprung” showing a preview image and tour description
Parcours “Dekadensprung (Leipzig)”: a map with eight numbered stations, below it the station list with a photo and short text for each
Station page “Schaubühne Lindenfels”: a photo of the red-and-white theatre facade on a street with tram tracks, followed by a pull quote and its attribution
App screen “Ansichtskarten” (postcards): a card assembled from photo tiles, with a share button and the photo gallery to pick motifs from
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Developer Experience for Nuxt

Open Source Plugins (Since 2022)

Dark card "Nuxt Prepare" with the tagline "Run async code at build time, before Nuxt finalizes its config" and a pixel-art animal
Video still of a person with glasses pointing upwards with both index fingers; behind them infographic posters, a clothes rack and a floor lamp
Dark card "Nuxt Gtag" with the tagline "Google Analytics, Google Ads and Consent Mode v2 for Nuxt" and a pixel-art lion
Dark card "Nuxt API Party" with the tagline "Auto-generated composables for any API, typed from OpenAPI and never exposing your credentials"
Video still of a person with glasses pointing diagonally downwards with both index fingers; behind them infographic posters, a clothes rack and a floor lamp
Dark card "Nuxt Vitalizer" with the tagline "Better Largest Contentful Paint scores in Google Lighthouse" and a white pixel-art bird
Dark card "Nuxt Kirby" with the orange Kirby logo and the tagline "Kirby CMS data in Nuxt, via KQL or the REST API"
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Volkmar Kühn

Photography & Website (2021–2023)

Person in a hat and scarf stands at a petrol station with the nozzle in the car, looking into the camera; mountains in the evening light behind
View of a castle with a tower set against forested mountains and a valley
The sculptor's website: a dark navigation column on the left, the article "Kunstspeicher Mildenfurth" with a photo from the exhibition hall on the right
Two people pull a yellow cloth off the lettering "KUNSTSPEICHER" above the entrance; the seated audience is reflected in the glass front
Bronze figures in the exhibition room: slender standing figures on a black plinth, a horse and rider on a pale plinth; a person in a hat blurred in front
Three people stand close with their arms around each other in a bright exhibition hall, with other visitors in the background
Two children draw on a stone base in the grass, above them a large seated bronze figure with a slender body holding something in its hands
Two people stand in a bright gallery in front of large glass doors, between rows of sculptures on tall black stands, with framed artworks on the walls
Person in a hat sits with papers at a microphone before a brick wall, a person with a cello to the left; audience from behind, a blurred bronze in front
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KATAPULT-Magazin & KATAPULT-Verlag

Design System & Website (2019–2021)

Screenshot of the katapult-magazin.de homepage: ice cream cone logo, navigation, and three article teasers with map graphics.
Stacks of printed magazine sheets showing the spread "Pendeln mit dem Zug? Eher nicht …" with a railway-track graphic.
Screenshot of an article page on katapult-magazin.de: body text above a turquoise subscription box with the issue cover and a "KATAPULT abonnieren" button.
Staff sorting and packing mailings among large stacks of paper.
Screenshot of the KATAPULT-Verlag website: catalogue listing with book covers on the left and descriptions with an order button on the right.
Bundles of mail tied with string, each topped by a handwritten green postal form marked "Presse / ELN".
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