In Listening to the walls whisper several mobile systems were distributed to the people to accompany their walk across the Plan D'Aou, a district in Marseille, France which they could press  on the walls making it possible to listen to the sound by vibrating the material of the wall.

Mobio is also a sound device which reverses usual urban listening : with headphones, personal, intimate.  Echelle Inconnue shares how they made the Mobio device,  circuits, code and materials lists.

Depending on your skills you might be able to make a Mobio for yourself. Remember Echelle Inconnue has shared this with you under open source creative commons liscencing - so please respect the attributes for using the codes and circuit diagrams.