Totally retro - maybe you had one 30 years ago? 3D Viewer comes with three story discs each depicting a different part of the movie making process told in only pictures: "Welcome to the studio!", "Behind the scenes!”, and “Action!”. Simply insert the disc into the viewer, hold it up like binoculars and face a light or window. The stories that the children tell will be awe-inspiring and probably different each time! Measuring approximately 5 x 3 x 4 inches it’s the perfect size for little hands. Best for ages 3+ and YES! if you have old discs they will fit this viewer!