A few years ago I had a conversation with a staff member from Uytenhaak Architects about concealed texts in Amsterdam, relating to my own work ‘stoned forever’, which is integrated in brickwork in the Olympic Quarter. He said that there is a text in Morse code incorporated into the Droogbak (1989), a residential building by Uytenhaak: ‘Deze muur staat er niet’ (‘This wall isn’t here’). It is located close to the railway line. Rudy Uytenhaak later told me that this was his last opportunity to protest against the acoustic fence that had to be constructed for bureaucratic reasons.