If you've ever passed a park in Chinatown and seen the older folks playing Mahjong, you've undoubtedly seen them manually "shuffle" the tiles between games before rearranging them into fresh rows. This is how they've done it for thousands of years, but in the past few decades, Mahjong tile shuffling and dealing has received a rather awesome upgrade:

The big question is, how do they do it? You've undoubtedly noticed in the first vid that they start off with sky-blue tiles, and the next set dealt is yellow; that's because the table stores a ready-to-go second set beneath the surface while the first game is being played up top. But you've also probably spotted that the tiles are thrown into the bin willy-nilly, yet the elevators bring them all up face-down. Here's how it works: