what is metal-experiments fr?

This is a small collection of visual effects for iOS apps, built with Apple's graphics technology called Metal along with SwiftUI, the standard framework for building iOS interfaces. Each effect is a self-contained folder with its own description, a preview picture, a short video, a setup file, and the actual effect code, so someone can pick a single effect and drop just that folder into their own project without needing the rest. The README lists five effects included so far. Singularity is a swirling black hole style animation that responds to dragging, making it look like spacetime is bending. Water shows a sunlit pool with waves that bend a tiled floor underneath, light patterns dancing on the surface, falling raindrops, and ripples that spread out when you touch the screen. Martian Sand shows a desert dune scene with sunlight raking across rippled sand, blowing dust, and a small dust devil that reacts to touch. Snow shows a nighttime winter scene with a moon, layers of falling snow drifting at different depths, a snowbank, and a burst of snow where you touch. Night Sky shows a colorful deep space scene with a tilted view of the Milky Way, layered twinkling stars, occasional shooting stars, and a glow effect where you touch the screen. Every one of these is built from a single shader effect and requires iOS 17 or newer to run. To try any of the effects yourself, you install a tool called xcodegen, go into the folder for the effect you want, generate an Xcode project from it, and open that project to run it on a simulator or device. This is aimed at developers who want ready-made visual effects they can study or reuse, rather than a full application meant for end users. The README does not mention a license.