Big murals - giant works of art covering entire house facades, often with a political message. In his book Icons of Street Art, photographer Michael Harker demonstrates the special power and meaning of this kind of street art with photos taken in Berlin, Lisbon, Paris and New York City. His large-format pictures present the art of various artists, with one focus on the works of Bordalo II. With his Trash Animals, the Portuguese artist draws attention to the subject of environmental pollution. His unique mix of upcycled sculptures and spray graffiti is in great demand at art fairs worldwide.