The Artloop Festival 2011 edition was taking place  in Sopot along  Haffner Street and it was a set of open-air concerts and instalations prepared by various artist. Jacaszek has invited  electronic composer, sound artist and avangarde drummer Paul Wirkus to  special performance based on sounds of nature. Refering to Olivier Messiaen’s  “Birds Catalogue” and Wirkus’ work “Forest full of drums” (with Stefan Schneider) both artists performed an improvised concert. The concert was an addition to Jacaszek’s instalation called “Ukryte (Hidden)” created as Artloop commissioned project.