In 1939, Edwin Mayer and Harold Graves of Sawyer's Photo Finishing Service and William Gruber of Welte & Sons teamed up to take advantage of Kodak's new, cheap color film. They mounted 14 transparencies in a disk to make seven stereoscopic images, which could be seen in a portable viewer.

The View-Master was born.

The little device was originally conceived as an educational tool, but it quickly became a popular way to see the world in the comfort of one's home.  It has gone through many iterations; I used to own the Model C, a heavy 1950 model made of black Bakelite, but it broke.

Now I have the new, light-weight G, and it works pretty nicely.  Have a look inside!