@spendius,
Arabic as written has visual balance. The claim is that the Koran is perfect, that it could only have been written by a divine being, that to change just one word would knock it out of balance.
There is also a challenge, that if someone were to doubt its divinity they should try to reproduce said, and so far nobody has.
Don't get me wrong, I'm not making these claims, and I've yet to meet anyone fluent in Arabic who is not a Moslem , to ask what they think.
There is a tradition in Islamic art not to make anything perfect in deference to God. The carpet weaker will incorporate a small flaw in the weave, and so on.