All right, they don’t exactly claim to notice fly shit on a painting, but they do make a point of focusing on the least significant details, not the most significant ones, in order to determine, for example, whether a painting is an original or a copy. According to them, when art forgers imitate a painting, they pay attention to major, significant details, like the roundness of the subject’s face or the position of the body, and these they reproduce precisely. However, they rarely pay attention to little details like earlobes or fingernails or toenails, which is why they ultimately fail to perfectly replicate the painting.