The mirrors are a compelling sight: they are big - some huge - and rather forlorn. While we know they were demonstrated to "work", they raise far more questions than they answer.
We went to see the survivor above Hythe, now in a bit of a sorry state. It was best approached across a very muddy field, and it was a cold and windy winter day. It seemed a good plan to have a toddler and a lady on crutches in the party.
It really was jolly interesting.