The two original recordings were made simultaneously on the 29th of September 2009 between 1:30 p.m. and 2:30 p.m. at both bridgeheads of the Hohenzollern Bridge in Cologne with directional microphones. Only the sceneries at the respective ends of the bridge are recorded. Both takes are synchronised and shall be listened to with ear-plug headphones.

Take 01: left bridgehead—left ear <—Hohenzollernbridge—> Take 02: right bridgehead—right ear