At first glance, the blue lines definitely appear to be slanted relative to each other. In fact, they are strictly parallel, and the deceptive effect is created due to the combination of colors. You can check this by looking at the picture, squinting a little and squinting your eyes.
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All the mugs in this photo are the same color, but it seems to us that they are painted in different tones. In fact, the only difference is the colored lines that surround them. The whole secret is in them 😱🙈✨✨✨✨ MAGIC ILLUSION !