With his ‘ground painting’ Trouble Makers, Mainz artist Jens Andres has blended humour and depth to amuse and bemuse the public. In each of the car parks on Neuer Messplatz, Zeyherstraße, and Friedrichstraße, he has marked two parking lots with a white coloured pictogram on a blue background. Done in the correct colours for road signs, they state that the parking spaces are reserved for UFOs. With his witty paintings, Jens Andres questions our habitual perceptions and the way we constantly obey other peoples' dos and dont's.