This is the boy who has lately started asking to read his Lego instruction manuals for bedtime story. (I have so far avoided it, but we do sometimes "read" chapters of The Lego Ideas Book, which is actually quite good; I highly recommend for any Lego-obsessed persons in your household.)
He recently looked up from some dog-eared instruction manual and asked, "What kind of people make things that move?"
After some clarifying counter-inquiries, I learned that he meant what kind of profession designs things like cars and boats and airplanes and... (he at first wanted to include "animals" in the list of "things that move" which these people might design, but I excluded them).
"I think you might be talking about engineers," I said.
"I want to be an engineer," he said and turned to the next page of his instruction manual.
Now that I'm about to post this, I remember a few weeks ago something I never managed to blog. He was talking about the things he would build "when I get my remote control gear box" and you can only imagine the thrill I felt when he listed (1) a remote control car followed immediately by (2) a robot that CLEANS FLOORS AND PULLS TICKS OFF OF YOU.