David Bowie remains an icon not only for his music, but for hisstriking looks.

The “Space Oddity” singer wasn’t born with this eye condition, though.

The man to blame was Bowie’s childhood friend, George Underwood, as Quartz reports.

David Bowie smiling into the camera

But what happened between them, and what caused the condition in the first place?

As it turns out, Underwood was also the person who permanently changed Bowie’s eye color.

Though Bowie’s left eye was forever altered, the incident only strengthened his friendship with Underwood.

David Bowie dressed as Ziggy Stardust

In fact, Quartz noted that Bowie even thanked Underwood for giving him “a kind of mystique.”