Kinetic art expressions based on optical and luminous phenomenon as well as painting illusionism. The expression "kinetic art" in this modern form first appeared at the Museum für Gestaltung of Zürich in 1960, and found its major developments in the 1960s. In most European countries, it generally included the form of optical art that mainly makes use of optical illusions, such as op art, represented by Bridget Riley, as well as art based on movement represented by Yacov Agam, Carlos Cruz-Diez, Jesús Rafael Soto, Gregorio Vardanega, or Nicolas Schöffer. From 1961 to 1968, GRAV ("Groupe de Recherche d’Art Visuel") founded by François
Art of Illusion the plugin does and most importantly, which class implements it. In some cases the XML file specifies methods that are exported for use by other plugins or specifies plugins that are imported for use by the plugin. Tags used in the "extensions.xml" file are Author, Date, Plugin, Export, Import, Description, Comments, History, and Resource. The compiled .jar-files are added to the Plugins folder in Art of Illusion root directory and they are effective immediately at the next start up. A large number of plugins have been developed for Art of Illusion that are available on the scripts and plugin repository.