What caught Chris's eye when he followed a purple martin across a field in chapter 2?

In Chapter 2, Chris is captivated by the vibrant colors of the purple martin as it flits across the field. This bird's striking plumage and graceful movements draw his attention, prompting him to follow it. As he observes the martin, he becomes more attuned to the surrounding nature, highlighting his growing appreciation for the world around him. The experience serves as a catalyst for his deeper connection with the environment.