This complex tracing board of the degree of “Chevalier Prince d’Orient ou Chevalier del’epée” in the Kloss collection has more elements that I could cut out, but what’s with all these chairs?
I have a 1780’ies ritual of the degree. I can’t find anything that explains the chairs. The degree appears to be a forerunner of the 15th degree of the Ancient and Accepted Scottish Rite which is sometimes called “Knight of the East and the Sword” (or “Dagger”). In French the title of the degree is similar to that of the historical degree that I took the image from. The AASR degree also offers no explanation of the chair. Interestingly, in an old Dutch version of the degree, some elements are described that can be found on the old tracing board such as a rectangular Holy Temple, the Ark of the Covenant, an arm holding a trowel in the South and one holding a sword in the North (below the towel is in the North and the dagger or sword in the South) and the river.
In the Baylot collection there is a degree called “Chevalier d’Orient et d’Occident, Princes Jerusalem” and this text mentions “22 little thrones”, one of which is for the candidate. This degree also speaks about a “council” and the brothers are called “Worshipful Elders”.
Also compare the stools on the image in Les Plus Secret Mysteres (1820). See for example here.
From the collection (1844) of Georg Kloss (1787-1854) (Chevalier Prince d’Orient, ou Chevalier de l’Epée, avec tableau. 1765 Kl.MS:XXV.66)