Creating hollow metal sculptures is a popular method for reducing weight while maintaining structural integrity and artistic appeal. One of the most effective techniques is metal folding and welding, where sheets of metal are shaped and joined to form hollow cavities. This method allows for intricate designs without excessive material use.

Another approach is lost-wax casting, where a wax model is encased in a mold and melted away, leaving a hollow metal shell. This technique is ideal for detailed sculptures with complex internal structures.

Cutting and assembling pre-fabricated metal tubes or panels is also a practical way to create lightweight sculptures. By strategically arranging hollow components, artists can achieve both strength and reduced mass.

For larger installations, internal framework systems with lightweight supports, such as aluminum or titanium, provide stability while minimizing overall weight. Combining these methods with perforation techniques—drilling or laser-cutting patterns into metal—further reduces material without compromising aesthetics.

Ultimately, the choice of technique depends on the sculpture's design, size, and intended display environment. By leveraging these methods, artists can craft stunning, lightweight metal artworks that are both durable and visually striking.