It's in the original title, but I suspect it was intended to give us an idea of how small these sculptures are. Later in the article, it compares the sculpture

It's in the original title, but I suspect it was intended to give us an idea of how small these sculptures are. Later in the article, it compares the sculptures to human hair. I suspect that would've been a better benchmark since it's something we can see, but if you're already talking about something that's impossible to see with the unaided eye, the analogy works.