| 摘要 |
The present invention is directed to a book in which a content is impressed on its pages by invisible ink, and lighting means (e.g. a lamp, a LED, etc.), for exposing the content. According to one embodiment of the invention the lighting means is mounted on a track, therefore enabling the lamp to move along the track. According to another embodiment of the invention, the lighting means is mounted on a pen used for impressing invisible ink, thereby enabling a user thereof to view the impressed content while being impressed. A page of the book may further comprise a light sensor; and an audial unit, for producing sound upon sensing light. A page may further comprise at least two polarizers and a picture underneath, thereby upon changing the angle between the polarizers, a visibility of the picture is changed correspondingly.
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