In music, form is organic. Structure emerges from ideas. Ideas are born of memory. Memory and imagination are partners. Begin that way and let it grow.
Technique serves the imagination.
That is all there is to understand. What to Listen for in the World. Manic-depressive personalities and Doppelganger syndromes are a fascination of current musicology. The tendency to discover split psyches portrayed in string quartets and piano quintets is all the rage these days. It behooves us composers to defend ourselves.