In the realm of public art, some sculptures defy not only gravity but also modern detection systems. Among the most intriguing are outdoor artworks designed to be invisible to radar, blending artistic expression with advanced stealth technology.

One notable example is *The Stealth Sentinel* in Nevada, USA. Crafted from radar-absorbing composite materials, this towering abstract structure vanishes from air traffic control screens, creating a surreal juxtaposition against the desert landscape. Similarly, *Echo Void* in Sweden uses angled surfaces and specialized coatings to scatter radar waves, making it undetectable to nearby military testing facilities.

Another fascinating piece is *Ghost Obelisk* in Scotland, a sleek metallic installation that exploits geometric principles to evade radar detection. Its design was inspired by stealth aircraft technology, proving art can coexist with cutting-edge engineering.

These sculptures challenge perceptions of visibility and permanence, offering a unique intersection of creativity and science. While their locations are often discreet, their impact on art and technology is undeniable—proving that some masterpieces are meant to be felt rather than seen, even by machines.