Installation art is an artistic genre of three-dimensional works that are often site-specific and designed to transform the perception of a space. Generally, the term is applied to interior spaces, whereas exterior interventions are often called public art, land art or art intervention; however, the boundaries between these terms overlap.
Mail art (also known as postal art and correspondence art) is a populist artistic movement centered on sending small-scale works through the postal service. It initially developed out of what eventually became Ray Johnson's New York Correspondence School and the Fluxus movements of the 1960s, though it has since developed into a global movement that continues to the present.
