Creating hollow metal sculptures that are both lightweight and structurally sound requires a blend of artistry and engineering. One common technique is metal fabrication, where sheets or tubes of metal are welded or riveted into hollow forms. This method reduces material usage while maintaining strength through strategic reinforcement.

Another approach is internal framework design, where a skeletal structure supports the outer shell. Thin metal panels are shaped and attached to this framework, ensuring durability without excess weight. Sand casting can also be used to create hollow sections by leaving cavities in the mold, though this requires precision to avoid weak spots.

For intricate designs, electroforming deposits thin layers of metal onto a temporary core, which is later removed, leaving a lightweight yet sturdy sculpture. Additionally, laser cutting and 3D printing enable precise hollow geometries that optimize strength-to-weight ratios.

By combining these techniques, artists can craft striking hollow metal sculptures that are both visually impressive and structurally resilient.