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It is an animated .GIF file. The moving "emoticons" that you see in this forum are examples of animated .GIFs.
Using a tripod, I took two photos of the same subject using different lighting. The animated .GIF flips back and forth between the two pics. You can create these with various graphics programs, or by going to a website that lets you upload source images and build them into the final .GIF.
Phil Nelson
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