Bolygo’s take on the self portrait, Trace, is a 2008 sculptural device by the artist, which connects conventional ideas of sculpture, especially of the human form, to contemporary notions of topography and transcription. The piece involves a rotating cast of the artist's head traversed by an extension of a complex but completely mechanical device, which records depth onto a circular piece of paper rotating at the same rate as the head. The artist's own head is then transformed into a compelling topographical map of itself under rotation. The resulting image is noticeably a head, but a heavily distorted one, appearing almost like an image from a spirograph, an evolving concentric diagram of recorded depth.

Source: BalintBolygo.com