This technique consists of precise decorative motifs engraved on a thin glass surface.
The rotary decoration, derived from the engraving of hard stone, came to Murano from Bohemia between the end of the 17th and the beginning of the 18th century.
It consists of the grinding of the surface with special wheels, to obtain engraved or hollowed out designs. The optical effect, however, is of a bas-relief. The incision can be left rough or polished.