Walking at night, standing under the light, I saw a tail in my reflection. What is this?

When you see your reflection with a tail on the road, you are probably seeing an optical phenomenon called "optical illusion" or "mosaic illusion".

This illusion usually appears on mirror-covered roads or wet roads. Suddenly, people feel like they have a tail following their shadow. In fact, this is an illusion phenomenon caused by the refraction and refraction of light on the road surface.

specifically, when the light on the road shines on your shadow, and then passes through the water drops, dust and even pebbles on the road when it is reflected, it will be refracted and refracted. These reflections and refractions will cause your shadow to take on some special shapes and features, such as looking like it has a tail.

this phenomenon is only an optical illusion, and there is no danger. If you are curious, you can try to observe your reflection in other mirror or wet areas, or try a flat surface at home to see if it will have the same effect.