And how to tell what is a true mirror!
We have a few around the house, but I have only recently noticed how different they all seem to be. There are two square ones mounted on the wall that show a similar reflection but all of the others are different.
I didn't think it was a thing until more than a few guests mentioned the long, large one in the hall. Most stepped back in shock when catching their reflection saying 'good god I need to lose weight!'. It is admittedly a bit fairground, it squashes the head and broadens my smile 
However, how to tell which is correct, and is there even such a thing? I heard that the larger a sheet of glass, the less true they are. But then I have found trueness isn't necessarily reflected in the price (if you'll excuse the pun) - as our hallway 'fat' mirror was the most expensive.
I also heard that much older mirrors were true-r, so the antique dressing table set up might be our best bet!
Well, we had a bit of fun testing them out and even managed to disagree on some of them. We are all evidently bringing our own perceptions into it, too!
You can get used to a bad mirror. I have had a 'fat' one in my bedroom for 3 years now and just go with it as I like how large it is for getting dressed. I have to admit though, I didn't know I had lost weight thanks to it's generosity, so that was a surprise.
What are your experiences of household mirrors, and how much do they impact your self perception? I think it's interesting, but do believe there's no real answer so we all gotta go with the flow.......and variations of our mirrors!