James Turrell's Rodin Crater Project is
probably the most ambitious large-scale earthwork in situ. In 1977, he purchased the Roden Crater, a
dormant volcano northeast of Flagstaff, Arizona. Over the next thirty-some
years, Turrell has been reshaping and infilling the mountain to its original
form, leaving a cluster of spaces and walkways within. Apertures to each
compartment are being designed to filter various degrees of natural light and
to capture the subtle changes of the seasons within a cosmic landscape.