 "Mona Lisa" has no clearly visible eyebrows or eyelashes.Some researchers claim that it was common at this time for genteel women to pluck these hairs, as they were considered unsightly.In 2007, French engineer Pascal Cotte announced that his ultra-high resolution scans of the painting provide evidence that "Mona Lisa" was originally painted with eyelashes and with visible eyebrows, but that these had gradually disappeared over time, perhaps as a result of overcleaning.