"Of the 10, 000 stars visible to the unaided eye, five are the archaic Citadels — long since abandoned structures conceived by The Architects."
My castle drew inspiration from M.C. Escher's geometrical works, and mixed in is a pinch of sci-fi author Gene Wolfe's architectural sensibilities.
The towers gave me a good deal of trouble at first, they took a few tries to figure out. leaving me with a couple of prototypes.
The difficulties that came with building them came from aligning them to the structure of the dodecahedron (the 3d pentagon at the centre of the Citadel), without losing any symmetry. I didn't quite manage to get that goal without moving the goalposts. After simplifying the towers and adjusting a few of them, I got to a nearly symmetrical middle ground that was near enough my vision—ironically, I like it more because of that.