Light and foraging ants seem totally unrelated, but they have one thing in common: They travel along time-reducing paths. According to Fermat's principle about the refraction of a ray of light, the light bends when it meets matter with different refractive indices and travels through time-minimizing paths. Recently, similar behavior was reported in foraging ants in a lab setting: Ants bend their travel paths when they enter a substrate that slows them down. But would the ants behave similarly as the light passing through convex or concave lenses when they travel through impediments with lens-like shapes? A multidisciplinary team of researchers from Seoul National University (SNU) and DGIST in Korea composed of ecologists and an engineer conducted experiments in the field to find out if the ants behave similarly to light.