We adopt concepts from Bertin’s Semiology of Graphics and Wilkinson’s Grammar of Graphics to create a ‘language’ with a limited number of core concepts or ‘verbs’ that are combined with a declarative style of ‘writing’ visualizations.
If you want to dive straight in, try out the interactive REPL.
For a more detailed discussion of the framework and its design goals, please have a look at corresponding in article in Cartographic Perspectives:
Poorthuis, A., van der Zee, L., Guo, G., Keong, J. H., & Dy, B. (2020). Florence: a Web-based Grammar of Graphics for Making Maps and Learning Cartography. Cartographic Perspectives, (96). https://doi.org/10.14714/CP96.1645.