They literally 3D-printed an eyeball. And the blind guy can see again. Not a chip. Not a sensor. A full living human eye — retina, cornea, lens, optic nerve — built layer by layer in a printer. Bioengineers at KAIST in South Korea pulled it off. The whole thing took 6 hours to print. Living retinal cells stacked in precise layers with their own blood vessels. A hydrogel lens that auto-focuses. Biocompatible polymers shaping the white of the eye. And an optic nerve scaffold designed to guide fresh nerve growth straight to the brain. Then they put it inside a 31-year-old man who lost his sight 7 years ago in an industrial accident. Three weeks later, his brain started decoding the signals. He's now seeing at 20/60. Reading. Recognising faces. Naming colours. This is the first time a complex organ made of multiple tissue types has been printed AND successfully wired into the human nervous system. Science fiction quietly clocked out. Science just clocked in.