The image is a diagram, labeled 'Fig. 95', depicting a color mixing experiment. On the left is a partially transparent cube. The front face is open, revealing a white square within. The sides of the cube are labeled with colors: 'Red', 'White', 'Yellow'. The edges of the cube are marked 'Null'. The cube appears to be constructed from planes, suggesting a demonstration of how colors combine. To the right of the cube are five vertical planes, numbered 0 through 4. These planes are arranged in a row, receding into the distance. Plane 0 is labeled 'Null'. The planes 1-4 are blank, presumably meant to represent stages in a color mixing process. The top of each plane is labeled 'Null r.y.wh.' The overall impression is that the diagram illustrates a method for demonstrating how red, white, and yellow light or filters can be combined to produce different colors, with the planes representing the stages of mixing.