Maybe you look like Yves Klein's protégé, or perhaps you could be mistaken for a Smurf. Bruises: usually, they are normal. But sometimes, they also show up when you haven't bumped yourself at all. Then it’s time to pay attention. How do you treat disease, and how does your culture treat the sick? And when are you actually sick? Cities have been plagued by plagues for centuries, fictional or otherwise. What does blue mean to you?