Our tax system relies on you to truthfully and voluntarily self-assess and comply along with your land tax obligations. Any land you own with whole taxable value beneath the land tax threshold. Examining Cai Guo-Qiang’s photographic series The Century with Mushroom Clouds, Ben Tufnell explores the work’s connections to American land art and its use of touristic tropes as methods for evoking histories in landscapes. Robert Smithson’s huge earthwork Spiral Jetty 1970 turned an instant icon of land art, partly due to iconic photography by Gianfranco Gorgoni, and just lately resurfaced after being submerged under the Great Salt Lake.