Abstract: The present device allows for continuous control of the saliency of textual material by the person attempting to memorize said material. A preferred embodiment of the device described herein consists primarily of two linear polarizers, a housing for the polarizers, and a lever. The polarizers are mounted parallel to one another in the housing such that the textual material can be viewed through said polarizers when said material is placed behind the device, and such that one of the polarizers can be rotated with respect to the other polarizer through a ninety degree angle by use of the lever such that the amount of light transmitted through the polarizers will vary continuously from some maximum value to some minimum value. To memorize certain textual material, one places the device over said material, rereading said material while progressively moving the lever such that light transmission through the polarizers varies from the maximum value to the minimum value.