The five-bay arcade is carried on octagonal piers, the arches on the north side being lower and more pointed.
The second diagram abandons octagonal symmetry in favour of clarity.
The lower part of the tower is round and the upper part is octagonal.
On the top of this is an octagonal plate and a gnomon.
It was interpreted as a religious site including an octagonal shrine some 10 metres in diameter.
At each of the four corners of the cube, is a dome-capped octagonal tower seven stories high with a staircase inside.
It is probable that this is the remains of the northern half of the original octagonal glass cone structure built in 1777.
Activated in 1867 and renovated in 1959, the lighthouse consists of a white tower on an octagonal brick building with 2 floors.
