The Extent of Self Reflection

You can change who you are,
Because who you are,
Is just a bundle of perceptions,
Shaken up in a jar,

And twisting the lid is not impossible,
Nor is looking back upon yourself to see,
Through the glass, who you are,
And who you could be.

And actively rearranging.
Now, of course you are,
Going to ask who's doing the rearranging.
Well, that's just going too far.

For, to be alright,
There are some things you should never ask.
And, in case that jar breaks,
You have to keep on your mask.