The image shows a series of five cubes labeled b0 through b4, arranged in a row. Each cube is depicted in a simple, isometric projection, showing three faces. The cubes are shaded to indicate depth. Each face of the cubes is labeled with abbreviations representing colors or shades. Below each cube is a text label indicating the interior color. Here's a breakdown of each cube: * **b0:** The faces are labeled 'l. y.', 'or.', 'r. p.', 'n. wh. n.' and the interior is 'Ochre'. * **b1:** The faces are labeled 'l. gr.', 'br.', 'l. pur.', 'bl. l. bl.' and the interior is 'L.Brown'. * **b2:** The faces are labeled 'l. gr.', 'br.', 'l. pur.', 'bl. l. bl.' and the interior is 'L.Brown'. * **b3:** The faces are labeled 'l. gr.', 'br.', 'l. pur.', 'bl. l. bl.' and the interior is 'L.Brown'. * **b4:** The faces are labeled 'l. y.', 'or.', 'p.', 'n. wh. n.' and the interior is 'Ochre'. Below the series of cubes is the text 'Fig. 107.' The background is a pale yellow.