People in Poland have figured out an amazing way to reduce their carbon footprints. They’re getting invisible pets. It’s much easier on the environment and there’s no stray fur stuck to their furniture or clothes. (At least not that anyone can see.)

Okay, maybe not. These photos are actually part of an awesome series by Weronika Krzemieniecka, an illustrator and graphic design student based in the city of Łódź in central Poland. Entitled Invisible dogs in Poland, the photos appear to be unassuming street shots of everyday people out walking their dogs. That is until you notice that, thanks to Weronika’s playful digital artistry, those dogs are completely invisible, with the noteworthy exception of their mysteriously cast shadows on the ground. 

[via My Modern Metropolis]