There is a large building with a green roof and steps leading to it

Book cover design featuring a cross-section of an ancient Japanese Kofun (burial mound), cutaway view. The center shows layers of earth, stones, and burial chamber. Surrounding the cross-section, arrange archaeological artifacts found in Kofun: bronze mirrors, magatama jewels, pottery, iron weapons. Include sketches of archaeological tools and measurements. Use earthy color palette: browns, greys, and muted greens. Add subtle decorative elements of ancient Japanese characters or symbols in the background. Style: realistic illustration with diagrammatic elements. Composition: centered, symmetrical layout with title space at the top.