- Titre: Series Invisible – Collection 2
- Artistes: Christoph Korn, Lasse-Marc Riek
- Label: Gruenrekorder
- Format: Book
- Genre: Field Recordings
- Prix: €13,00UE (incl. 7% TVA)€12,15non UE
"The sound of selected locations or specific sound phenomena have been recorded using a digital audio recording device. Later on these recordings were deleted.