HAPPY AS A CLAM
Lenticular button switches between two images: 1) image of a pink clam with closed mouth, positioned among aquatic vegetation and fishes, sea star, and sea horse. Black text centered on upper portion of button, white background. 2) The same, with the clam's mouth open, breathing out small, flower-like objects. Sea life in slightly different positions, as if swimming.
This button utilizes the technique of lenticular printing, which creates the illusion of motion and depth in static images. The lenticular effect is created by covering the image with a sheet of special plastic that is covered with tiny magnifying lenses. The image itself is also specially prepared: two or more images are interlaced into one image to match the particular lenticular lens type. The effect is created as the lense magnifies different parts of the image as the viewing angle changes.
SOUCE: LenticularPrinting.org Homepage. Retrieved on March 18, 2013 from http://www.lenticularprinting.org/