Creating hollow or lightweight metal sculptures requires a blend of artistry and technical skill. One of the most popular techniques is welding, where artists join thin metal sheets or rods to form intricate structures while maintaining a lightweight frame. Another method is metal casting, which involves pouring molten metal into molds to create hollow sections, reducing weight without sacrificing durability.

Fabrication techniques like cutting, bending, and assembling metal pieces also play a crucial role. Artists often use aluminum or titanium for their strength-to-weight ratio, allowing for larger designs without excessive bulk. Additionally, techniques such as repoussé (hammering metal from the reverse side) can create hollow, textured surfaces ideal for decorative pieces.

For modern sculptures, 3D printing with metal powders offers precision and intricate hollow designs. Combining these methods enables artists to push boundaries, crafting visually striking yet lightweight metal artworks that captivate audiences.