Unsurprisingly, Strange is all about that idea. He grins at Rita's explanation before he starts yammering about magic on his own.

"We wouldn't need to worry about supplies for our trial runs: I can coax the mirrors from myself until we return to the carnival," he blithely says, as if that isn't super creepy. "I think I have the theory on how to link two mirrors together, but we'd want a network, tens of individual mirrors linked up so that people could speak to whomever they choose. Likewise, we'd have to find a way to make it so that people could choose to send a message to a specific mirror."