Ah ~~ the lengths of some of the responses, the knots you are all tying yourselves into, the peculiar suggestions you are making ~~ all seem to me to re-establish the points made in my OP

I think the length is simply due to trying to explain in detail, and the examples are just to assist.

There are two short answers, both correct:

(i) There is no (physical) problem - as reported by gnu, Paul Burke, myself and others

(ii) There is a linguistic problem because the concept of 'left' is more subtle than it seems - as reported by Bill D, Newport Boy, myself and others. But this is really a problem about words and the ideas they describe, so there's no reason a mirror even needs to be involved. If you want to go further on this aspect, expect much more complex and surprising results than looking at a mirror will give you. A few years studying Wittgenstein, for example, is probably a good start.