It is a technique enabling us to engrave glass at any depth and to make even very fine shape keeping the complete repeatability of the pattern. Not only stripes or lines but also any figure depictions if properly designed may be obscured with almost unnoticeable cutting of the surface or cut out almost straight through. Inside and outside of the lampshade. Also selectively eliminating the opal coat. Something very exclusive and unfortunately not cheap. Beautiful light for the most demanding.