Invented in the 1820s, the thaumatrope or "wonder turner" works on the principle of persistence of vision. Hold both strings to twirl the disc. As the disc spins, a series of quick flashes is perceived as one continuous image. Faster than the human eye, thaumatropes are considered antecedents of motion pictures, particularly animation.
The Titillating Thaumatrope is letterpress printed with handset metal type and a risqué vintage printer's block on a 4 inch paper disc. Packaged in a plain brown wrapper with instructions, nudity is concealed.