Two clip-paths, over the navigation:

- The first clip-path is a circle (top-left corner) - The second clip-path is a polygon, that acts like a ray (hardcoded, can be improved)

The original work by Iventions Events https://iventions.com/ uses JavaScript, but I found CSS-only approach more fun

Here's a demo and the codebase: https://github.com/Momciloo/fun-with-clip-path