Imagine my surprise on Saturday, when I glanced up from my knitting and saw this out my window....

...within seconds, it had already fade to this....

....and less than a minute, it was gone.
I guess I just happened to be in the right place, at the right time. I seem to remember seeing them often when I was younger -- is this another sign of aging or it a problem of not really looking? When is the last time you saw one?