[herself]

I'm coming to this discussion _well_ late, but was struck by the following comment by baba-prague:

Originally Posted by baba-prague

With The Fool, yes, this is a cathedral. We actually based it on St Vitus cathedral here - it has amazing gargoyles.

Interesting to note that St Vitus (quoting Wikipedia here) is

the patron saint of actors, comedians, dancers, and epileptics. He is also said to protect against lightning strikes, animal attacks and oversleeping, and is the patron saint of Bohemia.

I think there's a lot from this that lends itself to deeper understanding of the card - it also brings to mind St Vitus' dance, the dancing mania that (again, quoting from Wikipedia),

occurred primarily in mainland Europe between the 14th and 18th centuries; it involved groups of people, sometimes thousands at a time, who danced uncontrollably and bizarrely. Men, women, and children would dance through the streets of towns or cities, sometimes foaming at the mouth until they collapsed from fatigue.

Linked to St Vitus being the patron saint of epileptics, this supports the whole 'letting go' of the known, and 'diving into' the unknown, the subconscious.