I once saw a Macula font's ad here in Fontsruct and wanted to try to make smth similar with Fontstructor, and so the draft has been laying around since February (see the image in comments). This work is based off that draft and is more or less consistent. The result is similar to Four's font Rock Paper Scissors (and maybe some other fonts). Thank you.
I was thinking of something else and the thought "go forth and multiply" came to mind.
The word forth brought to mind 4th, with the 4 fully formed as seen here. So it had to be done. In the process, I've made the personal best smoothest fake circle yet on fontstruct, backed by a pixel-by-pixel matching of a real approximated circle in Ai.
An experiment with propellers. It seems to me like something four would make. Suggestions are welcome. Thanks.
02/08/17: Thanks to the new Kerning feature, a separate "r" is no longer required. Also made the rings a little rounder and fixed the rings on U and u.