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Here is another good example of this from the mighty optical illusions site (actually I did not know the name of this effect – and when I googled subway tile illusion this is the site that came up – and I’m glad I found it!) Off-the-cuff this reminded me of the Ponzo illusion, where our minds know that the lines are still running parallel, and our perception of other surrounding elements changes conditional on that dominant parallel lines pattern. And hence objects that are further away in the distance should not be parallel but should actually converge within the image.

Although the pictures are seperate (and have some visual distinction) our minds interpret them in the same “plane”. I actually went and edited the image in that example to make sure there was no funny business it was so dramatic an effect! Image included below.Īlthough I suggest to read the article (it is very brief) – to sum it up both pictures above are identical, although the tower on the right appears to be leaning more to the right.

I recently came across one of the most dramatic examples of this at the very cool mighty optical illusion site. Mach bands, where the color of an object is perceived differently given the context of the surrounding colors.Change blindness, which makes it difficult to interpret animated graphics that do not have smooth, continous transitions between chart states.This is applicable to making clear background/foreground seperation between grid lines and chart elements. The Rubin Vase optical illusion in which it is difficult to distinguish between what object is the background and which is the foreground.I enjoy reading about optical illusions, both purely because I think they are neat and there applicability to how we present and perceive information in statistical graphics. Save in the memory banks whether the slope of the lines in the left hand panel appear similar, smaller or larger than the slope of the lines in the right hand panel.