Why was the world created with the letter bet?

Why does the Torah's first word begin with the second letter of the Hebrew aleph-bet?

I can't say that I ever noticed.

Yet, insightful answers range from the simple to the complex.

Midrash B'reishit Rabbah theorizes that, "Just as the bet is closed at the top and at the sides, so one may not inquire what is below, what is above, and what is before, but only what is in front." In other words, we are not to inquire before the moment of Creation. The Torah beings with the letter bet instead of the letter aleph to teach us that something always comes before the beginning.

As satisfying as such a simple answer is, there's a more profound suggestion still.

God reserved the aleph for a higher purpose than physical creation: the giving of the eternal Torah at Mt. Sinai. The Decalogue begins with aleph. (This is something that I had noticed before.) So, as beautiful as the created world is, it is not an end in itself but simply the setting for God's eternal plan of salvation.