Pre-crawling?

Yesterday I put Jonas on his activity mat and when I looked at him again, he seemed to have turned. I chalked it up to the fact that I just didn't remember precisely where I put him or that Phin must have given him a little push.  However, this morning while making breakfast I set him facing some toys. When I came back he had most definitely moved.  I sat and watched (and took pictures with my phone) in amazement as he turned himself around 360 degrees trying to look at all of the things around him.  I think he's going to be off and ready to crawl very soon!