Pretty hardware. The knuckly invisible hinge by Soss is so intricate. The hinge is designed to be mortised into cabinetry and even full-size doors to allow doors to operate on "invisible hinges".
The hinge is like a piece of jewelry that is completely invisible when doors are closed and comes to life when doors are opened. They operate smoothly and quietly and can support very large, heavy (500-pound!) doors or small cabinetry.
These are costly little hinges and they take skill to install but they're perfect for cabinet work where every little detail counts.