[ETL]

The revolving shadow square ring is supposed to produce a regular series of days and nights for those living inside the ring world.

The spinning of the ring is also to simulate gravity, via the outward centrifugal force. The outward force will 'pin' people's feet to the inside perimeter wall.

[Svartalfiar]

The revolving shadow square ring is supposed to produce a regular series of days and nights for those living inside the ring world.

The spinning of the ring is also to simulate gravity, via the outward centrifugal force. The outward force will 'pin' people's feet to the inside perimeter wall.

Not quite - it's not an 'also'. The spinning of the inside ring is to simulate the day/night cycle. No one really lives there. The spinning of the outer circle is the one that spins for gravity.