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Q&A A huge transparent wall permanently separates two civilisations - what can it be made of?

I'd like two medieval societies to be separated from one another by a huge vertical wall. The wall is so high that no-one has succeeded in shooting an arrow (or anything else) over it. It disappea...

18 answers  ·  posted 6y ago by chasly from UK‭  ·  last activity 6y ago by chasly from UK‭