Video : Art work Allik, Kristi ; Mulder, Robert C.F. – Skyharp. – Kingston : LumiArt Audiovisual Laboratory, 1994. – VHS, col., stereo sound, 13 min 45 s.
Audio document Allik, Kristi ; Mulder, Robert C.F. – Skyharp : skyline variations. – Kingston : Allik/Mulder, 1992. – Audio Cassette, stereo sound.