The painting Castle and Sun creates an imaginary art world and represents a special expression in abstract art. The stylish images are created out of several different geometric shapes and various shades of color. The cityscape has been made up of a kaleidoscopic of shapes set against a deep copper background. Many triangles, rectangles, and squares comprise the abstract form of a cityscape whose colors were inspired by Klee's earlier trip to the northern African country of Tunisia. Above this unusual city is the sun which seems to illuminate it and bring light into the playfulness of form. The lone orange sun shines in the deep red sky created by strong lines of intense color and structure. In addition, various rectangular sizes add depth to the abstract image. The clay-colored background gives the viewer a clearer picture of what the shapes that form the city's outlines of intense color and light look like. Pops of yellow color bring the eye in and break up the brown color that appears everywhere.