This mirror is connected to your mind. It's like a mini portal. You can imagine any place and it will create a portal between you and there. No one will know the portal is there unless you stick your hand through or something.
So, what will you do with this magical hand-held mirror?
I would search through space and share my findings with the world.
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I'd probably spend the first few weeks trying to make a connection to places I've imagined/invented and then use it to see the world.