Where's T?

I ran upstairs to put C down for her nap.  When I came back down to the living room, there was no sign of T anywhere.  Now - this was at the time when they weren't moving very much - just scooting around on their tummies - usually around in a circle.   So I knew he couldn't have gone far.   After standing quietly in the living room for a moment, I heard a slight noise under here......

 And found this...

Someone thought he was pretty slick.....