Over the last weekend, spring arrived in our part of the world. The vernal equinox occurred, in fact, the week previous, and the weather has been growing warmer each day, on average. But Saturday was the first day I felt I could have the door open to the screen. I put the smaller of the two sitting room cat-trees up against the screen door and all the cats took advantage of it. As far as they were concerned, it was the first day of spring.