Penrhyn & Bugail
Quarried North Wales · since 1820
A field study in riven blue-charcoal stone

Split it where it
wants to break.

A working talk on cleavage, weather, and the chalk marks that outlast the slater — read straight off the dark face of the stone.

This is the Welsh Slate design system, applied by Curio Design — a design-style library for AI agents. Full Welsh Slate guide → designbycurio.com/learn/slate-roofing-welsh