Sun Tunnels documents the making of Holt's major site-specific sculptural work in the northwest Utah desert. Completed in 1976, the sculpture features a configuration of four concrete tubes or "tunnels" that are eight feet long and nine feet in diameter. The tubes are positioned to align with the sunrise and sunset of the summer and winter solstices, and are also pierced by holes that allow light to be cast in patterns of constellations. A kind of American Stonehenge, Sun Tunnels charts the yearly and daily cycles of the sun, and calls attention to human scale and perception within the vast desert landscape. This document includes stunning footage of the changing sun and light as framed by the tunnels on the solstices.