The Murano Style Art Glass 17 in. Blue Napkin Vase is a rare thing of beauty. It has so many colors beautifully blended in a stunning free flowing shape. This piece is truly stunning and will get accolades wherever she holds court. Art glass is a blend of many colors of glass and it is completely normal to have air bubbles appear in the glass. Colors may also vary from piece to piece making each one a unique work of art.