Digital sketch of the 13-century Karatay Madrasa ceiling pattern: gold strap-lines interlace on a 10-point star grid, locking pentagons, rhombi and decagons into an endless knot. Soft slate washes pick out selected cells, while three construction vignettes at right expose the underlying girih tiles—a star, decagon module and composite weave—linking Seljuk stonework to its geometric blueprint.