The golden section in the Pantheon of Rome, ca 118 AD
This is the plan of the Pantheon, Reproduced from
Ghyka, 1946,
pl. LXII. p. 147.
This is the analysis, due to David Fideler, 1984.
The triangle in the upper right corner of the plan
is the golden triangle.
Ralph H. Abraham, 11 May 1996.