In the Lesson 1 Dicussion thread, someone brought up the topic of orchestral position. The seating chart illustrations in the course are merely examples and "positions may vary depending on the work,the venue the orchestra and other factors". Even the same orchestra can vary their seating positions as shown below.
The Philharmonia site provides some examples of different seating charts showing a variety of seating positions: (used by permission from Philharmonia)
A seating layout with Triple woodwind, five horns
and four trumpets for a strong line of brass.
cellos right, 1st and violins stage left. Trombones right, horns left.
A large orchestra with C. von Dohnyani's favoured position for the cellos to the left of the conductor. Note: violins are split across the stage. Trombones left rear, horns right
Vladimir Ashkenazy's favoured layout, but with a vastly expanded orchestra.
Quadruple wind, seven horns (stage left), piano, celeste, harp, organ, etc.!
CVD = Christoph von Dohnyani. His favoured string seatings once again,
but note the positions of the basses, brass and percussion. Presumably
the hall was a factor on this occasion. Violins split across the stage, cellos left, trombones left rear (trumpets in front), horns right
This is the seating plan for a performance of Bartˇk's Music for
Strings, Percussion and Celeste which has an unusual symmetrical arrangement.
Brahms Symphony No. 1, as laid out for Maestro von Dohnyani.
And a CVD seating plan for quadruple woodwind.