Nick is blind and his friend, who is a tattoo artist, had enough faith in him to allow him to tattoo his leg. After a bit of basic training, Nick believed that he was ready.
It is often true that when someone loses one of their senses, their other four are heightened to compensate. Nick was able to use the vibrations of the needle to sense how much ink was being used and he would then navigate where the needle went with his heightened sense of touch. The end result is something you would’ve never guessed.
See the pictures below to view the masterpiece: