Circular Breathing (image above, video below) by Scott Snibbe:

is a personal breath recorder. By breathing and blowing into the mouthpiece, the viewer can record a breath pattern. After letting go of the button, the breath pattern plays back indefinitely, looping from start to finish. The piece amplifies the circular process of breathing into a circular recording. The work also mimics looped composition – the breath patterns are like break beats – the carefully chosen segments of sound that make up sampled music. With practice, viewers can also create seamless air loops. The breath impart to the fan a lifelike quality, which challenges viewers to contemplate the everyday equation of breath with life.

The work creates a small personal network between it and its user however while there are a lot of works that explore these types of personal or body networks much of them are in the form of wearable items, possibly masquerading as clothes, jewelery or devices that are designed to carry with you. Circular Breathing is sculptural, not designed to be a designers proposed solution to a particular problem but more of a responsive object which once interacted with takes on a life of its own by mimicking its user and can continue to exist without further interaction.

This is one work in the Breath Series of works by Scott Snibbe which also includes Mirror. Similar work includes Heart Beats Dust by Jean Dupuy.