Nebula
Rings on a nebula, like rings on an otolith...
Nebula image from NASA Jet Propulsion Laboratory-
Installation
Nebula is still a work in progress, and there is no current stable version available. You're welcome to download the current devel version from github with:
devtools::install_github("condwanaland/nebula")
Once downloaded, the app can be started with nebula::nebula()