it apart from the work of other conceptual artists. Ono would enact many of the book's scenarios as performance pieces throughout her career, which formed the basis for her art exhibitions, including the highly publicized retrospective exhibition, This Is Not Here in 1971 at the Everson Museum in Syracuse, New York, that was nearly closed when it was besieged by excited Beatles fans, who broke several of the art pieces and flooded the toilets. It was her last major exhibition until 1989's Yoko Ono: Objects, Films retrospective at the Whitney. Nearly fifty years later in July 2013, she released a sequel to Grapefruit, another book of instructions, Acorn via OR Books. Experimental films, 1964–72 Ono was also an experimental filmmaker who made 16 short films between 1964 and 1972, gaining particular renown for a 1966 Fluxus film called simply No. 4, often referred to as Bottoms. The five-and-a-half-minute film consists of a series of close-ups of human buttocks walking on a treadmill. The screen is divided into four almost equal sections by the elements of the gluteal cleft and the horizontal gluteal crease. The soundtrack consists of interviews with those who are being filmed, as well as those considering joining the project. In 1996, the watch manufacturing company Swatch produced a limited edition watch that commemorated this film. In March 2004, the ICA London, showed most of her films from this period in their exhibition The Rare Films of Yoko Ono. She also acted in an obscure exploitation film in 1965, Satan's Bed. Wish Tree, 1996–present Another example of Ono's participatory art was her Wish Tree project, in which a tree native to the installation site is installed. Her 1996 Wish Piece had the following instructions: Make a wish Write it down on a piece of paper Fold it and tie it around a branch of a Wish Tree Ask your friends to do the same Keep wishing Until the branches are covered with wishes. Her Wish Tree installation in the Sculpture Garden of the Museum of Modern Art, New York, established in July 2010, has attracted contributions from all over the world. Other installation locations include London; St. Louis; Washington, D.C.; San Francisco; Copenhagen; the Stanford University campus in Palo Alto, California; Japan; Venice; Dublin; and, Miami at the Fairchild Tropical Botanic Garden in 2010. In 2014 Ono's Imagine Peace exhibit opened at the Bob Rauschenburg Gallery at Florida