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LiIIabet Sun 08/05/05 14:09
A mirror. There is no preferred plane of rotation, so it itself is a form of 'inversion'.
gen2 Sun 08/05/05 14:31
I think Poplar needs this for a Telegraph crossword and the answer is Pin-hole Camera
brachiopod Sun 08/05/05 21:36
It would be nice if the question was put into some sort of context.
Come to think of it, it would be nice if there were some sort of question, (in an interrogative statement kind of way).
Hammer Tue 10/05/05 12:42
It amazes me that people expect others to spend some time and effort answering a question, but they can't even be bothered to ask it properly.