Esperanto symbols, primarily the Esperanto flag, have seen much consistency over the time of the language's existence (namely in the consistent usage of the colour green), though a few variations in exact flag patterning and symbology exist. The main flag of Esperanto, featuring the ('Green Star'), was adopted in 1905 for use as a symbol of mutual recognition among Esperantists, and is used by most Esperantists. As an alternative to the flag, the jubilea simbolo ('jubilee symbol') has been more recently proposed (in 1987). History Verda Stelo Since the earliest days of Esperanto, the colour green has been used as a symbol of mutual recognition, and it appears prominently in all Esperanto symbols. In a letter to The British Esperantist in 1911, L. L. Zamenhof, the creator of Esperanto, wrote: "It seems to me, that my attention was drawn to the color green by Mr. Richard H. Geoghegan and from that time I began to publish all of my works with green covers . . . Looking at one of my pamphlets that I had entirely by chance printed with a green cover, he pointed out that this was the color of his homeland, Ireland; at that time it came to me, that we could certainly look at that color as a symbol of HOPE. About the five-pointed star, it seems to me, that at first Mr. de Beaufront had it imprinted on his grammar [of Esperanto]. I liked that and I adopted it as a symbol. Afterward by association of ideas, the star appeared with a green color." The Verda Stelo was first proposed in an 1892 article in La Esperantisto for use as a symbol of mutual recognition among Esperantists. The flag was created by the Esperanto Club of Boulogne-sur-Mer, initially for their own use, but was adopted as the flag of the worldwide Esperanto movement by a decision of the first World Esperanto Congress, which took place in 1905 in that town. Other proposed flags and symbols In 1905, delegates to the first conference of Esperantists at Boulogne-sur-Mer, unanimously approved a version differing from the modern only by the superimposition of an "E" over the green star. Other variants include that for Christian Esperantists, with a white Christian cross superimposed upon the green star, and that for Leftists, with the color of the field changed from green to red. Some Esperanto speakers consider the traditional flag too