Cars, bikes, that sort of thing... [he pauses, actually registering that maybe that confused look is because the man might not be familiar with what a vehicle is or what it's used for.] ...modes of transportation.

[His expression becomes a little distant - as if he's closed part of himself off.]

I grew up in a place with a lot of scrap. Learning to reuse and repair materials was a useful skill there.

[It's...an innocuous enough explanation, but considering how curt he was saying that...maybe he doesn't want to talk about it much?]