Historian Timothy LeCain is interested in the bridge between humans and materiality. Last year, while driving his SUV home through the mountains of Montana, a large truck pulled in front of him and released a cloud of dense, noxious smoke. Like many cyclists, hybrid car drivers, and “No Kings” protestors, LeCain had been “coal rolled.” His tongue-in-cheek essay, “Thank God for the Coal Rollers,” explores the practice’s culture, intended victims, and even the unintended good it might enact.