The next thing I know, the train has worked its overnight magic, and the canyons of office blocks and black cabs have been replaced by red deer grazing on granite crags.
Walt Disney Imagineer Chris Beatty talks about the magic mirror and the new Seven Dwarfs Mine Train roller coaster, which opens in 2014, in this exclusive video interview.
You can be an entrance elf, a water cooler elf, a bridge elf, train elf, maze elf, island elf, magic window elf, usher elf, cash register elf or exit elf.