Lenticular lens stamp

There are two kinds of effects possible using this type of surface combined with special printing. You may have seen this with items produced for children.
 * A 3-D effect with part of the image floating above the rest.
 * A motion effect when the image is tilted or angled by the viewer. This can also be used to show different images using the same stamp.

 File:Bhutan 3D.jpg|Bhutan stamp showing the 3-D effect. File:US Magic SS.jpg|The US Magic souvenir sheet of 3 stamps with a rabbit popping in and out of a hat. 

Several countries including North Korea have issued such stamps of either type to date. Cancels are slightly problematic. Bhutan-era stamps were rather thick but were postally used, albeit mostly by stamp dealers. Very modern issues are thinner and can stand up to modern cancelling machinery.

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