as always, you know the source . . .
>"adapt yourself to the contents of the paintbox"
>- paul klee
Paul Klee's "Pedagogical Sketchbook" and two-volume "Notebooks" are
wonderful resources for both visual artists and composers. The former
volume is small and affordable; the latter set is large and expensive
but probably can be found in a good library. Kandinsky's "Point and
Line to Plane" is also a good reference.