Imagine the nightmare for word-processing software if this hadn't settled down:

Like the Greeks, the Etruscans and Italic-speakers wrote from right to left at first. Later they went through a phase called boustrophedon or ‘ox-turning’, when a line written right to left alternated with one written left to right, until they plumped definitively for left to right.

Source: Proto: A New History of Our Ancient Past, Chapter 5, by Laura Spinney.