A certainly peculiar thing that I have been wondering about, others too I've discovered, it was stated by Chryuop
here
"I have a question. It is something that really been wandering in my head for a long time. Why some words have a meaning in Kanji, but they are always used with other kanji to get to the same meaning?
For example 現 in itself already mean "reality", why not using that kanji alone?"
So the question is: Do I really need both kanjis for the world reality, whats the difference?