Try this experiment. Take a fresh trash bag, squish it and let it go. It immediately displays a series of lines that didn't exist before. These lines simply won't leave whatever you try. It seems to have memory. If you think about it, our face behaves much like a trash bag. A thin layer of skin packing physical and emotional baggage. Just like the bag, a face develops and maintains lines based on memory.
About 43 muscles and 14 bones interplay to make the face express a variety of emotions: sadness, anger, disgust, fear, surprise and happiness. Here's an easy tutorial of what goes into a face: bone, muscle, fat, and skin. Muscle is indeed like rubber. I learnt that people have been comparing biological tissues and rubber since 1880. Skim through this amusing scientific paper comparing the two on a variety of physical properties such as nonlinearity, anisotropy, inelasticity, thermoelasticity and age-dependency. Simply put, know that muscles stay flexible when used and stiffen when not. As a tissue gets older, it tends to harden more easily. And when a tissue dies, the muscle pretty much hardens up. Think rubber tires.
Try another experiment. Watch people on a street (zoologist Desmond Morris has the most interesting views on the topic). You'll see people with singular facial expressions even when they are doing nothing. The older people get, the more set are these expressions. This is basically muscles and memory in action. Every time you scowl/ twitch/ smile/ laugh, you are flexing your muscles well and creating memories for your face. The longer the dominant expression, the longer its physical manifestation.
So what do you do? The next time you have an urge to create a line (unknowingly of course), take one slow breath (knowingly of course) and reset the expression. Try it and you'll also notice that a physical reset actually causes an emotional reset - providing your system with a reboot.
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Screw all this. Just dab some skin cream and pump a memory-erasing toxin called Botulinum when needed. That's what Cameron seems to do.
