The image is a scientific plate titled "Adjustment of Flatfishes" by Francis B. Sumner. It consists of five separate square images arranged in a 2x3 grid. Each image features a different background pattern and a central, blurred, dark shape resembling a flatfish. Here's a breakdown of each image: * **4a:** The background is a fine, light gray and white checkered pattern. The flatfish shape is somewhat translucent and blends with the background. * **4b:** The background is a black and white checkered pattern with larger squares. The flatfish shape is more defined but still somewhat blurred. * **4c:** The background is a field of small, dark dots on a light background. The flatfish shape is less distinct and appears as a darker concentration of dots. * **4d:** The background consists of large, evenly spaced white dots on a dark background. The flatfish shape is visible as a darker area within the dot pattern. * **4e:** Similar to 4d, the background is large white dots on a dark background, but the flatfish shape is slightly more defined. The overall impression is that these images are part of a study on camouflage or visual perception, testing how well flatfish blend into different backgrounds. The images have a vintage, scientific aesthetic, likely from an early 20th-century publication.