In August 2019, the final phase of the Kunsthalle Darmstadt`s general renovation, which started in 2014, will begin. The forecourt will temporarily become a construction site from which something new will emerge. Construction sites mark the end of one state an the beginning of another. They require planning and inprovisation, patient adherence and departure from the familiar. In art, cooperative projects take on the form of building sites that are not only metaphorical, but are intended to have a real impact on the surrounding city as well. Together with the Kunsthalle Darmstadt, the Darmstädter Sezession is developing an experimental format as part of the festival «Den Bogen Spannen – Darmstädter Sezession 1919 bis 2019». During the reconstruction of the Kunsthalle`s forecourt in August and September 2019, the experiment will take advantage of the special situation and address it for one month. How can we deal with necessary phases of interruption constructively? Perhaps the seed of Peter Weiss´dream of reconciliation between workers and art is sown in the construction site? The arc is streched from the building site to the artist´s studio, from work to art, from spirit to shovel and from the White Cube into the ground.