Rowing, yes, that's how I saw it. It seems such an audaciously simple brainwave: levers lift things, BUT you can use them to move things sideways, just as efficiently, AT THE SAME TIME.
Ah, the 'sidewise' or 'shuffling'(?) concept is what I was not sure about I think.
Reckon I understand now & also reckon it's very sensible. It'd still take an absolutely BONKERS amount of time though!!!!
love
Moth