A Mover and a Shaker

What's different between these two pictures???? Isaac may not be rolling or crawling yet, but he is certainly moving. I was getting ready one morning and left him to play (as seen in the bottom picture). I came back to find him as he is in the top picture. How did he do it? Who knows...he's such a little wiggler! There's no doubt he'll be all over the place once he figures out the rolling thing. It's only a matter of time...