---
title: "Gust Flag"
url: "https://sanyam.sh/lab/gust-flag"
date: "2026-09-25"
---

# Gust Flag

Press the flag to raise it, and move past it to blow.

a flag toggle. press it and the flag runs up the pole, a gust rolls along the cloth with a halftone fill riding behind it, and the tails throw three splashes.

key insight: the cloth is described once in its own coordinates, along it from the pole and across it from the top edge, and every point drawn goes through one `warp`. so the outline, the solid fill, the halftone dots and the spots the splashes leave from all bend by the same rule and cannot disagree.

a raised flag never stops fluttering, and the halftone stays after the fill as the light on the folds: where the wave tilts the cloth away, the screen punches through. move the pointer past it and the pointer is wind.

- Reference: https://x.com/kippe07/status/2103036199774585026
- Source: https://github.com/SanyamPunia/www/blob/main/components/labs/gust-flag/flag.ts