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Message:: [QUOTE="kaparthy, post: 25419, member: 57463"]... or a theme... or a city...  or...  Within "theme" there are still many ways to express any certain aspect of a broad idea, but the basic advice to focus is well made and well taken. As I said, I have an interest in the medieval fairs at Troyes and other towns in Champagne.  As a collecting topic, it is very specific to time and place.  Of course, it does branch off.  There were Papal imitations of Champagne deniers.  Do I add them to the collection?  I fear that I must. Over on CoinPeople, I mentioned Pisa of the Renaissance and the life of Fibonacci. "Florence, Genoa, Venice and Milan would be good cities to work with. We all think about Da Vinci and the Borgias and all, but what really fascinated me was the fact that they used to have ALGEBRA CONTESTS in the main square...  After 1228 there is only one known document which refers to Fibonacci. This is a decree made by the Republic of Pisa in 1240 in which a salary is awarded to:- ... the serious and learned Master Leonardo Bigollo .... This salary was given to Fibonacci in recognition for the services that he had given to the city, advising on matters of accounting and teaching the citizens." It would be nice to have a coin from that time in order to wonder if this one of the ones they paid him with.[/QUOTE]