Patent ID: 8449302

Claim:
A game piece with a hidden image visible upon viewing the game piece through a decoder filter, comprising: (a) a first visible layer comprising an image that is gradient mapped to a first electromagnetic wavelength range, the first electromagnetic wavelength range selected based on a color hue for a decoder filter and having a first starting electromagnetic wavelength and a first ending electromagnetic wavelength, the first ending electromagnetic wavelength different than the first starting electromagnetic wavelength; and (b) a second visible layer comprising the image that is gradient mapped to a second electromagnetic wavelength range different from the first electromagnetic wavelength range, the second electromagnetic wavelength range selected based on the color hue for the decoder filter and having a second starting electromagnetic wavelength and a second ending electromagnetic wavelength, the second ending electromagnetic wavelength different than the second starting electromagnetic wavelength, and a disguising mask having an electromagnetic wavelength within the second electromagnetic wavelength range, whereby the image is visible upon viewing the game piece through the decoder filter.