This is really cool looking, and I have no idea what you'd use it for.
And this is just the neatest thing to play with: https://www.jasondavies.com/maps/hammer-retroazimuthal/
And this is just the neatest thing to play with: https://www.jasondavies.com/maps/hammer-retroazimuthal/
It looks like one retroazimuthal variant (the Craig retroazimuthal) is sometimes called the "Mecca projection", so you know which way to kneel at sundown if you're into that sort of thing.