After a few weeks of rocking on her hands and knees, reverse motion and army crawling, Claire has figured out the real deal. She started crawling today.
After I saw it once, I had to grab a camera and lure her into moving a few more times (not that hard). The bait? A sock, naturally. Here she is going for her sock, with an interruption mid-way, followed by a graceful face plant.
Now I suppose we should baby-proof or at least vacuum a bit more often.