My favorite part of the exhibit wasn’t part of robot expo at all, it just happened to be under the same roof. There were many many machines which sort and organize screws, bolts and other thingamabobs in order to hand them over to nail guns, robots, or clumsy humans.
Most of them worked by vibrating things randomly until they fell into place. Some, though, had optics in order to organize things properly, like this one which filters dice by color.