The amount of fluttering polythematic design here makes for a very dissonant but entirely interesting sound.
I can barely hear the sustained French Horns (which are squarely in their most mellow sonority), the flutes (trilling about in their pleasant color tone range).
The only sustained sound I can hear is the violin trills that are just barely inside their most pleasant register.
Notice the switch in timbre between the oboe (fairly sharp and brash sounding) to the cor anglais (fiarly round and darker).
Love how that these two parts are played fairly close to each other in terms of relative intensity, but the idea is that their tonal colors would be both roughly “golden.”
The last part of this section has a chromatically planed major triad split between the second flute (rich territory), an alto flute (warm territory), and the cor anglais (glowing). The color of these three combined with the first flute in it’s pleasant territory as any melody of any choir ought to be with this design, stands out.
The triad sounds incredibly dissonant and again throws Fux and Gradus Ad Parnassum completely away.
The violin trill in a pleasant range is a nice color contrast to the extraordinarily colorful woodwind figure.
The violin trill also provides a simultaneous contrast of free form rhythm (the trill) when paired with the more measured rhythm of the chromatically planed triad and melody.