Oh thank goodness for the explanation! The idea of expanded polystyrene tiles on the ceiling of Maes Howe beggars belief.
Great place, well worth a visit. Ours cost us a couple of thousand pounds. There were other sights to see on the Hebridean Princess Cruise but Maes Howe was the one which made it worthwhile.
The rest was wonderful too though...
Something is not right. This message is just to keep things from messing up down the road