title_body: Dragon curve floating on freshly brewed coffee
upvoted_answer: It's probably not a dragon curve, but the fractal projection of the Brownian motion of coffee lipids on the surface of your tasty beverage.
  
  Brownian motion is best explained by statistical physics. Small atoms or molecules collide each other continuously in very high speeds in the liquids even if they seem serene. However, as the total effect (average) of these collisions are quite stable, we see a still surface.
  
  The small particles, which are very light in mass, can be affected by these collisions. So, they may move with respect to these collisions. So, you can observe these collisions as Brownian motions if you put some very light powder or lipid on top of the surface of a liquid. Very probably, this is what you have experienced.
  
  Here you can find a very comprehensive list of fractal sketches, including the ones related to Brownian motion. Do any of them look similar?