Tattoo artist Eric Reyna is working on a tattoo reproducing the graffiti-covered Oceanwide Plaza on his friend's back, part of a celebration of L.A.

Taggers have graffitied at least 27 floors of a partially completed downtown Los Angeles skyscraper this week, right across from L.A. Live and the red carpet for Sunday's Grammy Awards.

In Miami and Los Angeles, cities that contain some of the most expensive real estate in the U.S., graffiti artists have recently made sure their voices can be heard and seen, even from the sky.