I am aware of several types of writing systems.
The first one would be left to right and a prime example is English and also most of other languages, no matter if they use letters or other symbols.
Another type would be right to left, which can be seen in Hebrew writing:
As you can see, the text in the image selected by me for illustration, a digital user interface of a Hebrew keyboard, is right bound.
In the above image you can see Japanese text, which is traditionally read from top to bottom in either horizontal direction, in which I mean that both existed, not that you can read one text both from right to left and left to right after going top to bottom.
Now I am wondering whether there is a constructed language that reads from the middle. I am pretty sure that there is no traditional language that does this, hence I am attending here.
Let me just create a concept here for you to understand. In such a language above rows would have the same meaning. In that case it is read horizontally, but from the middle, so that it does not matter if something appears on the left or right side.
You might be able to understand what I mean by saying "middle-written", i.e. you always start in the middle.
I think that a language like this should be really interesting and maybe useful, thus I am curious whether or not a constructed language written quite like this exists.