Place one edge of a visiting card along the line between the girl and the corset, so no shadows falls on either side, rest the tip of your nose against the other edge, look at the corset and the girl will appear with the corset on.

Trade cards were one of the most prevalent forms of advertising in the U.S. from around 1875 to 1900. They had their origin in England in the 1700s with tradesmen advertising their wares. The advent of lithography in the 1870s made it possible to mass-produce them in color. The Philadelphia 1876 Centennial Exhibition sparked the beginning, as many were passed out at that event.