That we have, literally growing out of our bodies, this mass of flexible, changeable stuff we call our hair is remarkable. Not because its a vestigial part of our long lost body pelts, but that its capable of growing to such length, and is similarly able to be twisted, rolled, waved, picked out, crimped, dyed, straightened, and clipped in pleasing shapes.
Over the centuries, we have applied all our artistic talents, and no small amount of technological skill and advancement, to making of our noggins a wearable sculpture. We've used our hair to convey status, religious belief, sexual prowess and availability, intellect, artistic demeanor, and a host of emotional, and psychological states that would be wordless without the endless expressive nature of hair.
Over the many centuries of human existence, there is virtually nothing we haven't attempted with regard to how long, how vast, and how varied we have tried to get our hair. And now, with myriad chemicals to hand, feats of sculptural engineering are possible that would have been the wildest flights of fancy 100 years ago.