c1907-1908 Northwood Blue Opalescent Tree Trunk 11"h Swung Vase. (The freeform stretched & fluted shape of this vase was created when the glass worker literally "swung" the vase, hot from the kiln, 360 degrees around his body.) c1907-1908 Northwood Blue Opalescent Tree Trunk 11"h Swung Vase. (The freeform stretched & fluted shape of this vase was created when the glass worker literally "swung" the vase, hot from the kiln, 360 degrees around his body.)