As a PhD student in mathematics, I like my coffee - quite a lot. But I'm also poor (because, duh, I'm a PhD student), so my funds available for coffee are pretty limited. In order to still be able to have a decent cup of coffee, I decided to invest in a nice hand grinder and an Aeropress - figuring it would pay for itself.
So, here I am, hand grinding coffee beans, a local barista recommended, brewing what I consider to be surprisingly decent coffee and still - something is wrong.
My coffee - for some reason - has a dragon curve floating on its surface!
Unfortunately - being in my office - I am not able to take a picture of it. But it comes really close to an actual dragon curve, posted below for reference.
A dragon infested office clearly isn't suitable to work on ones thesis and hence I sit here, wondering about dragon curves and what might cause one to show up in my coffee cup instead...
Technical details: I'm using a fine - but thin - paper filter in my Aeropress and some blent of mostly Arabica coffee for my beans of a medium grind size. It seems most likely to me that the dragon curve I observe is made of lipids - especially since Arabica (according to a quick internet search) seems to contain a decent amount (~15%). That, however, doesn't explain its fractal appearance. I've seen lipids floating on coffee many times before, but as far as I can remember, they just formed boring puddles or were entirely absent (maybe due to using a thicker filter).
I welcome any attempt, preferably backed by published research, to explain this distracting phenomenon as well as pictures of similar curves formed by lipids on liquid surfaces (preferably coffee).