The Tricorn ley line passes through the two spiral ramps which edge the building to the south east and north. One of the ramps spirals up and the other spirals down, into the cavern below. This is where the spirits pass.

He wrote the Tricorn poem soon after beginning his survey of 'our atheist cathedral'.

A cold war cathedral, built to be buried
under a mound, as at Silbury.
Known to the Druids as "Elen’s Bower",
it was a May Pole enclosure - in past times -
where maidens danced amongst the stones
of a circle, by the hanging tree, in hysteria.
Aubury surveyed this sward, calling it
"the mound ship of Portus, and of his household."
Being aligned with the fort at Hilsea -
and echoing of the Lump Forts in the swell,
and the muniments on Portsdown Hill,
and at their centre, measured easily -
it guards its groves and maidens, although fallen,
and holds the platform of the city up
above the rising waves, unconsciously.