1. The pretty/handsome one would want to outshine the other:
They want to be MORE outstanding!
2. They cant share the same fashion:
They want to be unique and be the first to know the latest fashion
before they lose out and start copying ideas from good friend!
3. They compete with one another (BUT WITHOUT SHOWING) :
Studies results, muscular body/sexier figure, height, weight,
size of pupil, face features, talent, hairstyle, dressing,
whose girlfriend/boyfriend is more pretty/handsome etc etc..
You name it, they'd compare.
4. They cannot stand people praising their good friend:
They will think that they are more handsome/
pretty/educated which makes them jealous.
YES! JEALOUSY IS THE KEY
OF WHERE MOTIVATION COMES FROM!
We humans are strange,
we need to be agitated
then we'll change for the better.
Weird creatures..
5. They gets jealous and motivate themselves to improve!
When they are not able to do so, they will start to dislike them.
Bad mouth them, turning the true beauty
to an extreme unimaginable ugly.
OTHERWISE,
TWINS.
Your would be twins.
Everything would be the same.
One may love it, but the other
may despise it w/o showing.