A couple of months ago, we released a new version of our ggseg R-package for visualisations of brain atlases. I had been wanting to create such an update for a long time, but getting the internal logics of a ggplot geom working as I wanted was rather difficult. Likely because I was trying to do too many things, but, hey… that’s me!
One of the main things I wanted to get rid of, was this need to first group your data before sending it to ggplot if you want to facet.