Sainer and Bezt are a couple of Polish graffiti artists collectively known as Etam Cru. They are the artists behind these large scale murals plastered all over Europe. They met while studying at the Academy of Fine Arts. Individually, they’re pretty successful freelance designers and commercial artists, but together, their artwork has taken the Europe by storm. Their art can be seen in Belgium, Norway, Russia, Germany, Bulgaria, Austria, and Portugal. They were also one of the contributing artists to the city beautification project in Lodz, Poland undertaken by the Urban Forms Fondation.
Take a look at their website.