Aut cum scuto aut in scuto
But good times, in their own way.
It would seem the mowers in the photo stand a chance of leaving a small windrow for the next mower if they aren't careful. It would seem more logical to me to circle the field counter clockwise.
You might mention that to 'em next time you see 'em. ;-) Kidding aside, you wonder how many 100's of years they took to get it right. Imagine handing down a tool or at least a design of a tool and how to use it, for hundreds of years.
Hard to improve on perfection.