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This installment is called Private Ear.

The role of the private ear is to expand the threshold of audibility, to try and push people to hear something that wasn't there when they first heard it.

Lawrence Abu Hamden is an internationally celebrated artist who works with sound

and an internationally recognized expert forensic listener.

He likes to refer to himself as a private ear.

Like the private eye, he never knows who will come knocking on his office door looking for help.

When I visited him in Beirut last summer, he was working on projects both for museums and

human rights organizations. Amnesty International had enlisted him to help with

the gathering of ear witness testimony from one of Assad's secret torture facilities in

...