Hair Today... New Persona Tomorrow?

I've come across a problem whilst filling out my application for a passport: haircolor.
Haircolor? Oh shit. Do I write my natural hair color (blond), which I haven't seen in over six years, or the color that my hair tends to be the majority of the time (red)? Maybe I should just put "multi" or "various" or perhaps just "?!" in the first two boxes.

It brings to mind the notion that hair is so much of our identity. Watch America's Next Top Model, for example. You tell a conservative model would-be she's going to have to be nude in a shoot, you see hesitation and maybe some tears. You tell any model she's getting her long hair chopped off, and chances are she's on the floor sobbing like a baby.

I've never quite understood the tears in that situation. Then again, my hair grows uber quickly.
It's been long enough to sit on, short and spiky, bright orange, magenta, various shades of red, brown and blond, even blue-streaked. I've dyed it myself and even lopped off my own bangs a few times with varying success. If hair is a big part of our identities, I wonder what this says about me?