This exercise is the ultimate display of trust.
Scott Campbell is a well known tattoo artist in Brooklyn, New York. The name of this project is 'Whole Glory', it involves him offering free tattoos to people as long as he chooses the design and doesn't show it to them until he is done.
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The exercise shows ultimate trust in the tattoo artist and his craft. However, a lot of people seem to trust him and have participated in the excercise.
The interested customer is required to stick his arm through a hole in a wall with Campbell on the other side. He then proceeds to tattoo their arm and they can only see after he is through with the design.
Campbell has inked celebrities such as Marc Jacobs, Orlando Bloom and Penelope Cruz in the past.