Rings on a nebula, like rings on an otolith...
Nebula image from NASA Jet Propulsion Laboratory-https://www.jpl.nasa.gov/spaceimages/details.php?id=PIA16009&fbclid=IwAR2yfUVgfTlb-MviSoTz8AGCXzXoT4CF7EabSdVtq1hjMJF9c2NmtA62mTg
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:
Once downloaded, the app can be started with
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