Cool stuff! I love the direction.
The issue with the current logo isn’t so much that it’s not very literal - logos aren’t illustrations and don’t have to be literal - it’s just that it’s a bit untidy. Oddly cropped, peculiar colors, and looks a bit like the rear lights of the car in front of you in the rain. If it could be simpler, vectorised, drawn with more detail - perhaps it could be refreshed…
The triangle shape in your sketches is great - I don’t think it’s been overused in the Julia ecosystem, and I think it could be a strong component of a good logo. Lots of potential for exploration I think:
I’d also suggest trying some ideas without the blends - blends are cool, but don’t always reproduce well on stickers and t-shirts, or at low resolutions…
Maybe you can get the asymmetrical look (with the walking stick) working well… I’m not sure the “f” is saying anything to me, but perhaps you’re tapping in to some maths vibes that I wouldn’t be aware of. 