Big Bird watches the magic blocks float away through his legs. This is actually harder than it looks. You have to be careful not to knock Bird's head on the ground, and when you turn upside down, you're working to camera backwards, which is kind of disorienting. That big white square in the photo, incidentally, is a reflector for directing (in this case) the sunlight around.

Photo from Rick Lyon's Private Collection
Big Bird Name and Likeness © Sesame Workshop
Unauthorized Reproduction or Redistribution in Any Form Strictly Prohibited