The farmer in the coffee shop had the answer to my question:
"What you saw, friend, was the blueing of the alfalfa. A rare and beautiful sight out here on some of our fields. You were lucky. Lasts only a few days. Wind blows all the colourful little flowers away. Stops you in your tracks when you see it."
And that's exactly what it did. I had driven out to a bridge construction site in the country north of Drayton. Beautiful sunny day in early summer. I came upon a couple of blossoming canola fields, brilliantly yellow. And then this remarkable deep blue field of alfalfa. Other fields green in other early grasses. The landscape had the appearance of some child's enthusiastic pre-school colouring book.
It impressed me to think of this rare beauty out there. Being seen by so few. Lasting but a short while. Holding the profundity of a clear summer sky in its little yield. Quickly gathered by the wind.
I have been reminded of the words of Peter in his First Epistle:
24. For all flesh is as grass, and all the glory of man as the flower of grass. The grass withereth and the flower thereof falleth away:
25. But the word of the Lord endureth forever. And this is the word which by the gospel is preached unto you.