Doppio filo is a collection of vases made by combining two different colours of filigree rods. The linear, oblique pattern is obtained thanks to a refined glass making technique called “mezza filigrana” invented in Murano in the first half of the 16th century and still used by only a few glass masters in Murano. The complex realisation of these pieces requires the use of long glass rods previously prepared and containing individual coloured glass “threads” in the centre. After being superimposed, intertwined and melted, the rods are wrapped around the molten glass and blown to obtain the desired shape.