westside-historic:

One Saturday morning, on October 29, 1966, a massive 60-foot-tall painting of a nude pink lady holding flowers suddenly appeared as you headed into the tunnel on Malibu Canyon Road.

A 31-year-old paralegal from Northridge, a woman named Lynne Seemayer, showed up on the road and admitted that she was the artist who did the piece.

Seemayer said that she was annoyed by the graffiti that was all over the canyon wall (“Valley Go Home” was a memorable slogan) and so, over a 10 month period, she started to secretly climb up under the moonlight and suspended herself by ropes to remove the graffiti.

At 8 P. M. on October 28 Seemayer painted the Pink Lady using ordinary house paint. By dawn it was done.

Source: http://boingboing.net/2009/12/01/the-story-of-the-pin.html