The portrait of Mona Lisa in the Louvre in France is forbidden to take pictures. Even if you shoot it, you can't shoot it well: the work is placed in a dark corner and the light is very poor. There is dim light projected on the picture above the painting, and the yellow color temperature is extremely strong; Not only that, the work is covered in a glass cover with strong reflection; Tie a chain in front of the glass cover so that you can't get close; People outside the chain are always shoulder to shoulder, and you can't see the whole picture.