"So far I've talked to the President of the United States and told her she's welcome to set up customs around the magic door in case scary Canadians attempt to depart Mars," Bella says. "Everything else is still a work in progress. Magic isn't generally known on my Earth. Me and four other people have the general-purpose kind, and a few score worldwide have specific powers that do one thing and they generally aren't advertising themselves - some don't even know. But I certainly hope there will be trade. Enterprising businesspeople setting up pet shops in Olympus. Olympus is the city I built on Mars to start out," Bella explains.