For my last post, I will share this illusion which was very popular when I was a freshman in high school. When this image is seen the viewer will see the dancer spinning either clockwise or counterclockwise. That same viewer could look back at the image and see her spinning in the opposite direction. In fact, as I type this post with the image in my peripheral, she keeps changing directions!
The reason that her direction is so varying is because the image has no depth cues. This is called a reverse, or ambiguous image. This image specifically was created by Nobuyuki Kayahara. Apparently, once you are able to see her change directions, you are more likely to see it happen again.
Link: https://well.blogs.nytimes.com/2008/04/28/the-truth-about-the-spinning-dancer/?_r=0
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