Italian Murano Art Glass "Sommerso" Vase. Unsigned. Colors such as blue, yellow and clear. Measures - 8 3/4" high x 4 1/2" wide. Sommerso or "sunken glasses", is a form of artistic Murano glass that has layers of contrasting colors (typically two), which are formed by dipping a gather of colored glass into another molten glass and then blowing the gather into the desired shape; the outermost layer, or casing, is often clear. Sommerso was developed in Murano during the late thirties and was made popular by Seguso d'Arte & Mandruzzato family in the fifties. This process is a popular technique for vases, and is sometimes used for sculptures.