Cunei spectaculorum in theatro ita dividantur, uti anguli trigonorum, qui currunt circum curvaturam circinationis, dirigant ascensus scalasque inter cuneos ad primam praecinctionem; supra autem alternis itineribus superiores cunei medii dirigantur.
The blocks of seats in the theatre are so to be divided that the angles of the triangles which run round the curve of the circle indicate the ascents and the steps between the blocks to the first circular passage. Above, the upper blocks of seats are arranged with alternate staircases facing the middle of the lower blocks.
final_alignments\Vitruvius_Architecture_Book_5.json