( CNN ) -- Poland has become the land of the giants . In cities across the country artists have transformed the sides of houses and apartment blocks with enormous murals , some pieces stretching upwards of ten stories . The artists behind most of the colossal pieces are Przemyslaw Blejzyk and Mateusz Gapski , also known as Sainer and Bezt , and collectively as `` Etam '' . The two twenty-somethings met at art college in the central Polish city of Lodz having been into graffiti in their teens . They now work together on many of the projects . The duo has also worked with Natalia Rak , another young Polish artist who has produced her own larger-than-life pieces in Poland and the United States . Most of the recent projects by Rak and Etam have been commissioned by local city festivals , which have given the artists permission to paint without worry about being caught or prosecuted . From a tumbling jockey to a fantasy tree house , the artists employ a mix of modern styles and motifs from traditional Polish folklore . Each piece takes around a week to produce , says Blejzyk , and the reaction from the public is usually positive . `` For us most the important thing is to create an illustration where people could stop in front of it and turn on their imagination for a couple of minutes , '' he says .
Polish street artists ' [UNK] ' have been painting the sides of buildings across the country . Their work has appeared in Poland , Russia and Germany . Artist Jan Rak has also painted house - side murals in Poland and the UK .