- The conveyor that organises the pieces (45 seconds in)
- The pneumatic feeder that passes 1 block at a time (1:15)
- The pneumatic / motor claw that takes the brick to the correct colour bin (1:45)
Heck, I love the whole thing! :)
The whole video is long at 24 minutes, but mesmerising in a weird sort of way. After around 2 minutes, he dives down in to the detail of how it all works.