As RED writes, "The project, (inspired by a Jay Chou's song, 'Secret/不能说的秘密') took about 12 hours to finish.
Coffee is quite a challenging medium to use - too little water and the
rings wouldn't form easily, too much water and the rings would blend
into each other, resulting in just a deformed pool of coffee. I had to
also wait for the lighter parts too dry up before stamping on the
darker rings, or else the rings would not be visible."
