Rainbow flag number of non-cooperative groups led to confusion in several countries around the world. Another variation of rainbow flag is used by Jewish Autonomous Oblast, situated in the Far Eastern Federal District of Russia, by the Chinese border. Proportions 2:3. Adopted first of October 1996. The Jewish Autonomous Oblast has a flag with a seven-colour rainbow. The number of colours is meant to symbolize the seven-branched Jewish Menorah. The rainbow flag was popularized as a symbol of the gay community by San Francisco artist Gilbert Baker in 1978. The different colors are often associated with "diversity" in the gay community (but
Rainbow in his model. As he noted in his "Kitab Tanqih al-Manazir" ("The Revision of the Optics"), al-Farisi used a large clear vessel of glass in the shape of a sphere, which was filled with water, in order to have an experimental large-scale model of a rain drop. He then placed this model within a camera obscura that has a controlled aperture for the introduction of light. He projected light unto the sphere and ultimately deduced through several trials and detailed observations of reflections and refractions of light that the colours of the rainbow are phenomena of the decomposition of light.