They each show something cool about our perception.
"Filling in the Afterimage after the Image" (I could not get Blogger to accept the link to the animation; get it from the contest page) shows that (in my interpretation) the retina sees the 8-pointed figure as a superposition of two uniformly colored 4-pointed stars, and produces the corresponding afterimages.
"Dramatically Different Percepts between Foveal and Peripheral Vision" tells it all. (Again, link to animation from the contest page).
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