A model presents a creation from The Blonds during New York Fashion Week Fall-Winter 2025 in New York City, U.S., February 8, 2025. (Photo by David Dee Delgado/Reuters)

Japan's Riku Miura perform with Ryuichi Kihara, not seen, during the pairs free skating at the ISU Four Continents Figure Skating Championships at the Mokdong ice rink in Seoul, South Korea, Friday, February 21, 2025. (Photo by Lee Jin-man/AP Photo)

Ducati Lenovo's Italian rider Francesco Bagnaia rides during the free practice 1 session of the MotoGP Thailand Grand Prix at the Buriram International Circuit in Buriram on February 28, 2025. (Photo by Mohd Rasfan/AFP Photo)

Jockeys and their horses compete in the Cross Country Chase, the fourth race on the second day of the Cheltenham Festival at Cheltenham Racecourse, in Cheltenham, western England on March 12, 2025. (Photo by Justin Tallis/AFP Photo)

Jessie Diggins celebrates during a venue ceremony after winning the bronze medal in the women's sprint free cross-country skiing competition at the 2022 Winter Olympics, Tuesday, February 8, 2022, in Zhangjiakou, China. (Photo by Alessandra Tarantino/AP Photo)

An Afghan boy carries his wheelbarrow in Kabul, Afghanistan, Monday, August 5, 2019. (Photo by Rafiq Maqbool/AP Photo)

A person dressed like a zombie walks during the 2015 Comic-Con International Convention in San Diego, California July 9, 2015. The pop-culture held at the San Diego Convention Center event runs July 9-12. (Photo by Mario Anzuoni/Reuters)

Luis Hernan was always curious about how wireless technologies like radio are transmitted through the air. So after finishing up his studies in architecture, computer science, and design, Hernan decided to research these invisible signals through a PhD at Newcastle University. Hernan set up a system that turned the wireless signals around him into colourful, ghostlike images using long-exposure photography, allowing people to see the strength of the signals around them. (Photo by Luis Hernan)