I saw the mock up of this at the Aria casino, Las Vegas, about a year ago. And today, the real thing!
Renowned Swiss artist Ugo Rondinone’s colorful large-scale, public artwork Seven Magic Mountains is a two-year exhibition located in the desert outside of Las Vegas, Nevada, featuring seven thirty to thirty-five-foot high dayglow totems comprised of painted, locally-sourced boulders.
Visible across the desert landscape along Interstate 15, Seven Magic Mountains offers a creative critique of the simulacra of destinations like Las Vegas. According to Rondinone, the location is physically and symbolically mid-way between the natural and the artificial: the natural is expressed by the mountain ranges, desert, and Jean Dry Lake backdrop, and the artificial is expressed by the highway and the constant flow of traffic between Los Angeles and Las Vegas.
Miriam's Well: Poetry, Land Art, and Beyond 
Beautiful! Of course, the Magic Mountains are themselves between the natural and artificial. But maybe that is obvious….
You are right! The artist seems to see that, too. I still feel uncertain about the colors in this context.