Have you ever wondered how to put images inside type, like those old postcards for various cities? You'll find out today. It's called a clipping mask, and it's a digital version of spreading glitter onto a paper that has a design drawn in glue—the glitter only sticks to the glue. In this case, the new layers only stick to the base layer in the clipping mask. Making a clipping mask is easy, but it provides one of Photoshop's "wow" moments.