Arc mark (for donuts and pies).

[Fil]

Here's a nice(?) example found in the wild, of faceted donuts.

(originally from https://immunology.sciencemag.org/content/immunology/5/54/eabf3698/F1.large.jpg)

Source

The data is available, but I don't think it's the right dataset to use, since I don't understand what it means :)

[Fil]

linked to #22

[Fil]

see also https://github.com/observablehq/plot/issues/133

[spiderdab]

I think adding an Arc mark should be a priority.

[mbostock]

@spiderdab Please react to the top post by clicking the smiley face and then 👍 to upvote an issue. Thank you.

[matys1]

It would be nice for this to finally land.

[codewizard-dt]

Yeah why is this still on hold for 4 years? Do we need contributors? I'd be happy to help