This is a bit rough and ready but I did it in about an hour just to see if it would work.
I found a picture in Pinterest yesterday that showed how to draw spirals on an egg shell. It was just a series interconnnecting lines and circles. Not rocket science but presumably mathematical. Anyway, I thought I’d have a go.
To do this properly you need time, a tape measure and less frantic energy than I had this evening.
Anyway, it was an interesting experiment.
As I said. Rough. But it has potential. I’d love to get my hands on a goose egg or three.