Maybe it's the techno beat that makes this video so engaging, but I think it's the sound of dominos repeatedly smashing into each other. Smashy, smash, smash. It's so cathartic. And the structures they build here are wonderful. So tall and wide. But my favorite trick is the playing cards at 1:26.
They used over 20,000 dominos, and while this isn't actually one, long, continunous shot, that doesn't make it any less cool.
[H/T Laughing Squid]