I was sitting here writing up my blog post for today (not this post, by the way), when I felt the ground, the house, the world, sway. It was a gentle back and forth motion. I would have thought I’d imagined it except for the cats who were clearly disturbed by whatever phenomenon had just occurred. Less than a minute or so later, I felt it again. I looked outside, thinking perhaps the wind had rocked the house. However, it didn’t feel like the wind. Whatever it was had originated from below (and I was in the basement at the time).