In an article I published in 2013, I argued that one key difference between fantasy maps and the real-world medieval and early modern maps they purport to imitate is blank spaces: fantasy maps are full of blank spaces (that which is not in the story is not on the map), whereas real-world maps were covered in cartouches, sea monsters, inset illustrations and other embellishments. One of my sources for that article was a book by Chet Van Duzer: Sea Monsters on Medieval and Renaissance Maps (reviewed here).

Recently Van Duzer has been giving talks on the very subject of the lack of empty spaces on old maps. Which, as you can imagine, is very relevant to my interests. In October he spoke on the subject at the Barry Lawrence Ruderman Conference on Cartography, and earlier this month he gave a similar talk at the New York Map Society. Here’s the abstract from the Ruderman Conference:

Historians of cartography occasionally refer to cartographers’ horror vacui, that is, their fear or hesitancy to leave spaces blank on maps that might be filled with decorations. Some scholars have denied that this impulse was a factor in the design of maps, but the question has never been examined carefully. In this talk I will undertake such an examination, showing that horror vacui was indeed an important factor in the design of maps, at least for some cartographers, from the sixteenth to the early eighteenth century. Some of the factors that motivated cartographers’ concern about empty spaces will also be examined, as will maps by cartographers who evidently did not experience this fear. In the eighteenth and nineteenth centuries maps began to be thought of as more purely scientific instruments, cartographic decoration declined generally, and cartographers managed to restrain their concern about spaces lacking decoration in the interest of presenting their work as modern and professional.​

But since I couldn’t make it to those events, all I had was that tantalizing abstract. (Publish something!) Fortunately, we now have a little more: Greg Miller has written a piece about Van Duzer’s research over on the National Geographic All Over the Map blog.