in 1964. Christo began to make Store Fronts, wooden facades made to resemble shop windows, which he continued for four years. His largest piece was shown in the 1968 Documenta 4. In the mid-1960s, they also created Air Packages, inflated and wrapped research balloons. In 1969, at the invitation of the museum director Jan van der Marck they wrapped the Chicago Museum of Contemporary Art while it remained open. It was panned by the public and ordered to be undone by the fire department, which went unenforced. With the help of Australian collector John Kaldor, Christo and Jeanne-Claude and 100 volunteers wrapped the coast of Sydney's Little Bay as Wrapped Coast, the first piece for Kaldor Public Art Projects. 1970s Within a year of Wrapped Coast, Christo began work on Valley Curtain: an orange curtain of fabric to be hung across the mountainous Colorado State Highway 325. They simultaneously worked on Wrapped Walk Ways (Tokyo and Holland) and Wrapped Island (South Pacific), neither of which came to fruition. The artists formed a corporation to benefit from tax and other liabilities, a form they used for later projects. Following a failed attempt to mount the curtain in late 1971, a new engineer and builder-contractor raised the fabric in August 1972. The work only stood for 28 hours before the wind again destroyed the fabric. This work, their most expensive to date and first to involve construction workers, was captured in a documentary by David and Albert Maysles. Christo's Valley Curtain was nominated for Best Documentary Short in the 1974 Academy Awards. The Maysles would film many of the artists' later projects. Inspired by a snow fence, in 1972, Christo and Jeanne-Claude began preparations for Running Fence: a 24.5-mile fence of white nylon, supported by steel posts and steel cables, running through the Californian landscape and into the ocean. In exchange for temporary use of ranch land, the artists agreed to offer payment and use of the deconstructed building materials. Others challenged its construction in 18 public hearings and three state court sessions. The fence began construction in April 1976 and the project culminated in a two-week display in September, after which it was deconstructed. Their 1978 Wrapped Walk Ways covered paths within Kansas City, Missouri's Loose Park in fabric. 1980s Christo and Jeanne-Claude planned a project based on Jeanne-Claude's idea to surround eleven islands in Miami's Biscayne Bay with of pink