Both claimed that advances in realism and accuracy in the history of Western art since the Renaissance were primarily the result of optical instruments such as the camera obscura , camera lucida , and curved mirrors , rather than solely due to the development of artistic technique and skill. Nineteenth-century artists' use of photography had been well documented. In a book, Secret Knowledge: Rediscovering the Lost Techniques of the Old Masters , Hockney analyzed the work of the Old Masters and argued that the level of accuracy represented in their work is impossible to create by "eyeballing it". Since then, Hockney and Falco have produced a number of publications on positive evidence of the use of optical aids, and the historical plausibility of such methods. The hypothesis led to a variety of conferences and heated discussions. Part of Hockney's work involved collaboration with Charles Falco, a condensed matter physicist and an expert in optics.
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The Bogdanov affair was an academic dispute regarding the legitimacy of a series of theoretical physics papers written by French twins Igor and Grichka Bogdanov alternately spelt Bogdanoff. These papers were published in reputable scientific journals , and were alleged by their authors to culminate in a proposed theory for describing what occurred at and before the Big Bang. The controversy began in , with an allegation that the twins, celebrities in France for hosting science-themed TV shows, had obtained PhDs with nonsensical work. Rumours spread on Usenet newsgroups that their work was a deliberate hoax intended to target weaknesses in the peer review system that physics journals use to select papers for publication.
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