Add elegance, movement, and science to your garden. Inspired by Thomas Jefferson's affinity for invention, based on a 19th-century design, this wind vane is fascinating to watch. Aluminum cups catch the wind and circle the stake; as the wind increases, they pick up speed, rise, and point to the relative wind speed shown on the brass arrow. Meanwhile, the arrow turns to face the direction of the wind. The brass finish will patina with age. Mounts in the ground or on a deck or patio. About 16"w x 47"h x 6"d.