For 3-dimensional effect, the orientation of the lens must be vertically. For flip, animation, motion and morphing effects, the cards could be shown out "up-to-down" or "left-to-right"------ we called it "orientation of change".
For "up-to-down" changing, the tiny rows of parallel convex lens are positioned horizontally. Flip, animation, motion, morphing effects could be seen only if you rotate the image along the x-axis or you view the image from different up or down position.
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