Mirror of Erised Musings

[Scott]

No: HPFGUIDX 17704

Oh dear! In my last message I spelt my name 'Sott'. How embarrassing 
is that?!? *blushes*

I have been thinking about the Mirror of Erised lately and a few 
questions came to mind. 

Firstly, when Harry finds the mirror of Erised in the empty classroom 
what is gaurding the stone? Dumbledore was taking a big risk by 
removing it, since we assume he didn't know who was trying to steal 
it or when. If fact this lends itself to the idea that Dumbledore did 
know Harry would go after the stone as he was obviously setting him 
up for a later battle. But does that mean that maybe he knew who was 
going after it. He couldn't have known Voldy was inhabiting Quirell 
and allowed it?!?!

Secondly, how is that Harry in the Quirell scene was able to see 
himself getting the stone and not his family again. How is it that 
the rules could change so that the mirror showed the desire relevant 
to the task at hand and not his true desire for family.

Scott