Creating bronze sculptures with intricate interior spaces or voids is a complex process that combines artistic vision with advanced metalworking techniques. The most common method is the lost-wax casting process, which allows artists to achieve remarkable detail in both exterior and interior surfaces.

Artists begin by sculpting their design in wax, carefully forming both the outer shape and any internal voids. For particularly complex interior spaces, they may build the wax model in sections or use removable core materials. The wax model is then coated in multiple layers of ceramic shell material, creating a heat-resistant mold.

During the bronze pouring stage, the wax melts away (hence "lost-wax"), leaving behind the ceramic mold that perfectly captures every detail. Molten bronze is poured into this cavity, filling all spaces except where the artist has intentionally created voids. After cooling, the ceramic shell is broken away to reveal the bronze sculpture with its precisely formed interior spaces.

Modern artists sometimes combine traditional techniques with contemporary methods like 3D printing to create even more complex interior structures. The result is breathtaking sculptures that invite viewers to explore both their external beauty and hidden internal dimensions.