Tonight Tyler asked me, "Why do we have two eyes instead of a Y?"
I asked what he meant, saying that I didn't understand. He repeated his question, and I repeated mine.
He responded (with an upturned hand - an often used gesture indicating he is telling me something he considers very important),
"Why don't you listen to what I am saying to you?" (I think he's heard that before).
I cracked up. I explained why (I think) we have two eyes, instead of one. That appeared to be a sufficient explanation. I'm still not quite sure what he meant by the Y. I will be on the alert to try to discern what he meant... :)