Thank you, giant human imagination, for continuing to redefine what is possible on tiny human nails. From recreating entire scenes from The Simpsons to horrifying a nation, nail artists are always pushing the envelope. In this case, a South Korean trend called "shattered glass" is the new thing that will make you wince and say "ooooh pretty" at the same time. The innovation is credited to Eunkyung Park, owner of Unistella Salon in Seoul.
Bad news: it's not actually broken glass. That would be so metal! The illusion is actually created by thin layers of cellophane that take on the tones of the base coat color. Looooooook:
It's probably for the best that it's not really glass. Fancy manicures are anxiety producing enough, it would be much worse if you might cut yourself.