ViewMaster Sesame Street - 3Reels - Green Earth, Blue Skies - 3Reels with 21 3D images from Sesame Street about Green Earth, Blue Skies You will need a ViewFinder Viewer to view the 3D images. Viewers are available here on Amazon. The Sesame Street gang learns to appreciate the earth and agree that they should all do their best to take care of our beautiful earth. Start your child on a lifetime of enjoying the thrill and excitement of stories. Stories challenge a child's mind to grow - even before the child learns to read. With ViewMaster reels, children can see their favorite stories come alive in the extraordinary world of 3D.