15thc perception on swallowtail merlons?

[Koen G]

The map is great. I am curious to see what it will look like in a year or so....

I tried looking for some more examples but they are hard to come by. Swallowtail merlons in art seem to be the kind of thing you typically come across by accident. This is why I like the concept of an ongoing collection. It's also nice to see the form emerge c. 1290's and throughout the 14th century.

The map uses layers, so it is possible to add different collections of geographical data as well.