[MrForbes]

It's still a hand waving fantasy. But one plan as of last night is a sliding lift that will pick up a tote from the side, and possibly a container the same way. The more solid plan is to have a low arm that will pick up a tote from the side, and lift it high enough to put it on top of another tote. And have another longer arm mounted higher up, that can grasp a container or a tote, and place it on top of a sort of tall stack. The fun part is figuring out how to make the robot so this stuff can be done quickly. We have some ideas...but they're still being worked out. And a few more prototyping experiments can change our plans at any time.