This is a variant of the “filigrana” already known in Murano in the XVI century. It is obtained by joining two conical vases under heat, covered externally with thin coloured rods, one arranged clockwise and the other anticlockwise. A network is thus formed with a rhomboid-like mesh. The rods with different thicknesses, within each quadrangle, cause the characteristic air bubble.
In the early part of this century this technique was adopted by a great many glass faetories to make glass services. The most refined and perfect examples are those made at the end of the 20s. Blown objects of large dimensions and a geometric form with extremely thin walls in spite of the enormous difficulties of exceution was by Giacomo Cappellin.