The artwork is actually very reminiscent of the one done by Steve Argyle for The Hippodrome planechase plan.
The hyppodrome is actually in the background It is the building with all the arches, in the same style as ancient roman hippodromes and theaters.
EDIT: or at least I think it is.
"When Worzel summoned Segovian angels to fight fight.."
Worzel.
That is cool.
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EDIT: or at least I think it is.