At first glance, Uriel Orlow’s show “What Plants Were Called Before They Had a Name (Guatemala)” appeared serene and innocuous. Swaths of canvas hung from the ceiling, with illustrations of plants thrown onto them by old-school overhead projectors whose emanating light bathed the entire venue in a warm glow. Each projection showed a single page from a publication on medicinal plants issued in the 1970s by the Instituto Indigenista de Guatemala, with a sketch of the plant and a list of ailments it could treat, as well as its name in Spanish. Every entry is disrupted by scruffy handwritten notes: