How did Alexander Calder balance the moving pieces of his mobiles?

Alexander Calder achieved the delicate balance of his mobiles through a process of careful construction and mechanical ingenuity. Rather than using complex machinery, he relied on his skill as a tinkerer, using simple hand tools like pliers to manipulate wire and shears to shape sheet metal.1

To create these kinetic works, Calder suspended flat metal shapes from movable rods using wires. This design allowed the individual elements to rotate and find an actual relationship in space, driven by natural air currents. His approach to balance varied based on the structure of the piece:23

• Cantilevered designs: Some mobiles were engineered to cantilever off bases, enabling the elements to rotate a full 360 degrees.1
• Point balance: Other works were meticulously crafted to balance on a single point, such as his 1949 piece Pomegranate.1

By experimenting with these configurations, Calder successfully transformed static materials into dynamic sculptures that constantly shifted their volumes and forms in response to their environment.2