Creating hollow metal sculptures is a popular technique among artists aiming to reduce weight while maintaining structural integrity. One effective method is using sheet metal fabrication, where thin sheets are shaped and welded to form a hollow interior. Another approach involves constructing an internal armature or framework, then layering metal over it to create a lightweight shell.

Forge welding and TIG welding are preferred techniques for joining metal pieces without adding excessive weight. Some artists also employ perforated or textured metals to further minimize mass while adding visual interest. Advanced methods include 3D printing with metal alloys, allowing precise control over wall thickness and internal voids.

Material selection plays a crucial role - aluminum and titanium are excellent choices for their strength-to-weight ratios. Proper ventilation holes should be incorporated to prevent air pressure buildup during temperature changes. These techniques enable artists to create large-scale installations that are easier to transport and install while maintaining durability and artistic vision.