The artwork consists of 200,000 stainless steel disks, each  in diameter and individually hung so they respond to air currents induced by train traffic. The work, along with others on the extension, was funded by a $1.5 million federal grant and other sources.
The artwork comprises 200,000 stainless steel disks, each measuring in diameter and suspended individually to react to air currents generated by train traffic. The work, along with other projects on the expansion, was supported by a $1.5 million federal grant and additional funding sources.