He asked a question for which I had no answer.
". . . how do the cats like the new box?"
At the time, SWMBO told me that Blackwell had noticed it but after a cursory examination, was ignoring it.
Unusual but we figured maybe the hot weather was the cause.
Until I was cleaning up the kitchen after dinner and glanced down.
Aha, (thought I), apparently it's "just right".