It's a photograph, Uncle. Like the videos I showed you, but still. And Aang is...— well, you can talk to him about it yourself sometime. I helped him set up his phone, too. ...Aang, what was your username again—?

[ And indeed, Aang's voice can be heard now too, replying with "avataraang," simple and direct choice in name. ]

It's "avataraang." I told him you are here. I'll give him your username, too.