The color of infinity inside an empty glass

You can't define anything about a person using only one spectrum. It's foolish to try.

When someone changes significantly in more than one spectrum of measurement over a short interval of time, they've "become someone else."

Like if I started up with the Goth movement (stop sniggering!):

* Wearing all black - physical change.
* Being angst-filled - mental change.
* Hanging around with the undead - relationship change.

Add it together and you get a Significant Change from me. And I'm sure there are other ways to measure this.