The Resonance Box is based on a resonance watch movement that includes two balance wheels in close proximity to each other. A crown operates the gear train which then turns the two balance wheels that include free spinning gears. Under the lid is a signed rotor that spins freely. The watch tray compartment holds 18 watches with a small storage space in the center. As with all of my pieces, everything is made by hand. This piece is currently for sale and can be found on the Pricing & Availability page.