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It is a popular illusion that makes the parallel horizontal lines appear to be bent. Yes, you read it right. All of these lines are parallel. However, due to the black squares that are placed non-linearly, the lines appears to be bent. This illusion became so popular that it is now used in architecture as well.

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It is perfectly alright if you were not able to. The thing is that sometimes, our mind conflicts with the abundance of information that is provided to it. In this image, the color does not fits with the description. Our mind now knows and recognize all the colors. This is the reason when you come across a color with a different description that suggests another color, our mind is not able to produce the final result in a flow. This might not happen with all but happen with most of the people.

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Of course, there is no glow surrounding it. But yes, it is visible and is perceived by our brain. But why? The color of the background has not been interfered with and it is uniformly black. But the one that is into the play is the black lines which have been drafted to shape a heart inside the figure. It is actually changing the contrast of the image on those regions which are responsible for the neon glow surrounding the heart. You can check the image in any editing software and you will not find any difference between the background yellow shades.

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