What techniques did Paul Klee use in Ad Parnassum?

In his 1932 painting Ad Parnassum, Paul Klee utilized a pointillist technique. This approach is characterized by the application of numerous small, coloured dots that create a mosaic-like surface across the canvas.1

This work was part of a series of paintings created between 1930 and 1932 in which Klee continued to explore the use of geometric forms, a practice he had rationalized during his tenure at the Bauhaus in the 1920s. Ad Parnassum is notable for being the largest single painting Klee had produced up to that point in his career.1