A nearby field I pass on the way to my house from the interstate grows some kind of grass for hay, which is cut and baled, and then followed by a GMO corn (Pioneer) for silage. Year after year (Ugh). I had noticed his round bales encased in a white plastic over the last year or two, but I finally saw how it's done. I suspect he has the only set-up in the county to do this.
The machine accepts round bales from the back, and they get wrapped as the machine moves them forward, and at the same time the machine inches backwards so the wrapped bales drop off in line with previous bales and it's ready to accept another bale.
I found it fascinating even though I HATE that he grows GMO corn for his cows. Fortunately I think his fields are far enough away from my garden that I'm not too worried about pollen contamination, and I don;t grow corn anyway.