It's a work of art. The magnificently choreographed dance of
manufacturing lenses seems like an ancient tradition as old as
making swords or soap or something (which I guess isn't
surprising because it is glass that they're making). We've seen
Nikon produce the glass inside its lenses but this video shows
the entire lens making process—you see sand basically become a
Nikkor lens. Incredible. [Nikon Imaging via PetaPixel]