This kinetic sculpture creates a strong, unique optical illusion as it rotates – it appears that the marbles are either rising or falling. The 24” spiral is steel and is powder coated (a baked-on “paint”). Large marbles are 3” to 3 ˝”. The “wind twirler” rotates the sculpture in the wind; indoors it is rotated by hand. Many buy it for the beauty of the large marble as much as for the illusion. A screw eye and a very strong string for hanging are also included, along with instructions.