The image is a close-up, microscopic view of a portion of a beetle's eye, labeled as 'FIG. 20. PORTION OF BEETLE'S EYE. x 550.' The eye is composed of numerous hexagonal facets, each resembling a tiny, slightly convex lens. These facets are tightly packed together, creating a honeycomb-like pattern across the entire surface. The facets are a muted, grayish-brown color, with subtle variations in tone that create a sense of depth and texture. Each facet has a small, bright highlight, suggesting a reflective surface. The overall effect is a highly detailed and intricate pattern, showcasing the complex structure of the beetle's eye. The image is presented against a plain, off-white background.