Oh, my god, that's just priceless. Amazing work on every level.
All the more interesting because I recall from my advertising studies days a failed version of this. A wool manufacturer wanted to show off their new range of colors, so they had a flock of sheep washed, fluffed and then (vegetable-)dyed a rainbow of hues. The idea was to have them herded here and there, much like this project 40 years later.
Didn't work. The dogs apparently didn't recognize the colored sheep as, well, sheep and refused to properly obey commands. These must be 21st-century dogs.