"First I have to at least give a general explanation about what this machine does," she said, tinkering with the control panels. "Based on my experience at Canterlot along with a riveting conversation with Princess Celestia, I've found that there is not only one world with our alternate selves, but possibly an infinite number of worlds. And with this information I have found a way to view these worlds in real time using the mirror as the base. All I had to do was adjust a few settings, add this fluxmeter, tweak this-"