X-ray glasses are a novelty product designed to create the illusion that the user can see through solid objects. They are plastic framed eyeglasses with special lenses made of cardboard. The manufacturing process involved in their production includes plastic stamping, papermaking, printing and gluing. Inspired by the real discovery of x rays by nineteenth century scientists, x-ray glasses were introduced during the s as a gag product. Today, they have become timeless icons of American pop culture.