When you see the image from the NASA APOD website without rolling your mouse over the image, the line connecting A and B is not there, which makes the illusion much trickier. With the two squares connected, it is easier to see that the colors of A and B are
actually the same! This does not seem like something that is directly connected to astronomy, but it is meant to be a testament to the fact that human observations, especially those based on celestial objects, are certainly are not always reliable- as the majority of people are likely to be quick to think that the squares are different colors. Even with using measuring devices, people cannot always escape the illusions perceived by the brains and eyes of humans.
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