The interactive map shows only a fraction of coffee houses that existed in the small area surrounding the Royal Exchange yet provides a visual representation of the intense concentration of coffeehouses with largely mercantile functions and clientele in this area. The map shows how they were grouped in this area close to institutions such as the Royal Exchange, the Bank of England and the General Post Office in order to meet the need for cheap and flexible office space for the businessmen of this part of London where most of its commercial activity was and to a certain extent is still today concentrated. The map also shows the distinct characters of the different coffeehouses, often indicated by their name, which specialised themselves for specific types of customers such as merchants or insurance brokers and also for specific markets such as transatlantic or oriental trade networks. Shown below is a map of London's early modern coffeehouses by renowned artist and illustrator Adam Dant. This map like the interactive map shows the intense concentration of coffeehouses in this small area of London as well as giving brief descriptions of their characters in a map designed in a style similar to illustrations from the early modern period. The key source of information used to create the interactive map is Bryant Lillywhite's directory of London's early modern coffeehouses which charts the history of hundreds of coffeehouses that existed in London from the 17th to the 19th century including the ones listed on the map. Furthermore, Walter Thornbury's map of the damage caused by the 1748 fire in Cornhill is a particularly useful source for determining the exact location of these coffeehouses.