This is a vintage, late 20th century, 1990's, signed, hand blown studio art glass bowl measuring 15" wide by the studio of American glass artist Dale Chihuly (b. 1941) from Washington State. The bowl is done in an ombre spiral of blues and purple to clear glass. Stylistically, this piece is a departure from the glass forms he is best known for and most recognized. Chihuly began working with glass in 1965 and studied under Harvey Littleton. By 1968 Chihuly earned his Masters of Fine Art from the esteemed Rhode Island School of Design and with a Louis Comfort Tiffany Foundation grant and a Fulbright Fellowship he apprenticed at Murano glass studios in Venice, Italy. In 1971, after his return to the US, he co-founded the Pilchuck Glass School near Stanwood, Washington. His works are displayed in Institutions throughout the world and widely collected. The estimate is based on actual recent past recorded auction sales of comparables. Retail 'asking prices' can be higher and vary.