I've been reading through some questions trying to understand the usage of "Look, ..." before sharing important information. I have discovered this word placement can be considered an interjection or attention getter.
In my experience, when I say or hear something prefaced by "Look," it is intended to convey the listener needs focus on or bring their attention to what is said next.
I have been reflecting on this usage and was curious on the etymology or origin of using "Look" to mean "listen" or pay attention. I wonder if this may have originated from in person conversations as a means to have people make eye contact or literally "look" at the speaker.
My spouse was curious if I spoke this way because I was raised in the Southern U.S.; however, I have noticed this usage in Spanish language as well.