Symbolism in the French Revolution somewhat by region and period. The tricolore flag is derived from the cockades used in the 1790s. These were circular rosette-like emblems attached to the hat. Camille Desmoulins asked his followers to wear green cockades on 12 July 1789. The Paris militia, formed on 13 July, adopted a blue and red cockade. Blue and red are the traditional colours of Paris, and they are used on the city's coat of arms. Cockades with various colour schemes were used during the storming of the Bastille on 14 July. The blue and red cockade was presented to King Louis XVI at the
Historiography of the French Revolution American historian working in this tradition is Keith Michael Baker. A collection of his essays ("Inventing the French Revolution", 1990) examines the ideological origins of the Revolution. Timothy Tackett in particular has changed approach, preferring archival research to historiographical dialectics. He challenges the ideas about nobility and bourgeoise in "Becoming a Revolutionary" (2006), a "collective biography" via letters and diaries of the third estate deputies of 1789. His other major work is "When the King Took Flight" (2004), a study of the rise of republicanism and radicalism in the Legislative Assembly in 1791/2. Tackett also has several works focusing on