In the realm of public art, some sculptures defy conventional visibility—not to the naked eye, but to radio waves. These unique installations, often crafted from materials like carbon fiber or specialized composites, are designed to absorb or scatter electromagnetic signals, rendering them "invisible" to radar and radio frequencies. Among the most famous is *The Stealth Pyramid* in Nevada, a sleek, angular structure that vanishes from radar screens. Another notable example is *Radio Void* in Sweden, a towering sculpture made of radar-absorbent materials, blending seamlessly into its urban environment.

These artworks challenge our perception of visibility, merging science and creativity. While they may appear ordinary to passersby, their true innovation lies in their ability to evade detection by modern technology, making them fascinating subjects for both art enthusiasts and engineers alike.