The herringbone shed was developed by Ron Sharp, a farmer from the Waikato in 1952.
Herringbone's are kind of shaped like a fish skeleton, and cows line up on either side, where the bones would branch out from the spine. The farmer stands in a sunken pit in the middle - just like the type of pit a mechanic works from.
The farmer puts the milking cups on the cow teats from the pit, and it's just the right height so he can reach easily without having to bend down.
A herringbone shed can milk up to around 600 cows with only two people!
I found this really cool animation of how a herringbone shed works: