In 2004, Los Angeles Magazine called this piece "a 6 by 36 foot postcard of undulating ocean waves, swirling on-ramps, and city landmarks from Griffith Observatory to Angel's Flight." At that time, the mosaic was on the edge of its 50th birthday, having been installed at Parker Center in 1955 by Joseph Young.
That year, tours of the new Parker Center were in such high demand that a policewoman worked full time leading groups through the building. 8000 folks from September through December, 1955.
Yound died in August 2007 if you want to look up his obituary on the Los Angeles Times. I blogged then, but the link is no longer good. Here's a copy from the Pittsburgh Post-Gazette, which is where Young was born.
The above picture of the mosaic came from the Joseph Young fan page on Facebook, and there are more photos there. And here's an interesting b&w image on radaris.com--no idea where they got it.
I am actually on hold with the LAPD as I write this, trying to learn if the mosaic has been moved to the new police headquarters. Their hold music includes Beethovan's Fifth Symphony...quite nice.
Nope--the mosaic is still at the old Parker Center, and there are no plans to move it.