That... depends on if you mean in my own world, or the last place I got, uh... kidnapped to. Which. If you don't mind, I'd rather talk about the former.

[Lingering trauma and bitterness about his last world aside...]

I studied a type of organism common in my world; they were called mushi. They worked differently from most living things, so working with them in particular was a... pretty interesting line of work.