VIEW OF THE ROTUNDA AND THE GROTE KITK
The way the capital turns the corner was invented for the 45-degree corners at the Judge Institute Cambridge, England. The Trabica-Raft of the Entablature stays orthogonal over the column, completing the capital of the Working Order. The 'beams' to the next capital fair into it 'irrationally'.The joint between the capital cluster, and the beam can be seen above the Arch. This preserves the 'straightness' of the intermediate beams. One can have mouldings curving around a drum, but not columns. The dimensions of the trabica -top remain calculated by the overall width of the quatrefoil column diameter, in this case 6'0" (1.8M).
Curved work is always expensive, and curved on curved, or 'spherical' work even more so. The only parts of the Rotunda curved on plan were the columns, the gutter and the white arches. Everything else is 'straight'.
"Groenmarkt" Development for MAB at den Haag (the Hague) in the Netherlands.