Eight-year-old champion speed stacker Daniel Lin practices stacking at home, with cups designed by his father Pei-Teng Lin. Here, Daniel shows off his incredibly fast stacking skills. Towards the end of the video, Pei-Teng turns off the lights to show how the cups are lit from within by different-colored LEDs. Daniel stacks in the dark, to create a beautifully colorful display. Credit: Youtube/Daniel Lin