How do you describe the feeling of a 100-degree day in Austin? Temperature is at once an ephemeral and a universal experience – both clear and unavoidable, yet strangely evading description. It’s fitting, then, that “Fragile Vessels: A Gathering and Exhibition on Extreme Heat” included a bit of almost every media – documentary, field notes, thermal imaging, oil painting, film projection, zines, installation, and, of course, conversation – in an effort to explain and document what we all...