A lot of people have been noticing the colorful rocks near Las Vegas Boulevard and Sloan Road.
The pillars are part of an art project. It's called "Seven Magic Mountains." It's paid for with private money, costing more than $3 million.
The renowned Swiss artist, Ugo Rondinone, has been working on it for about five years.
"People are like birds. Whenever we see color we feel attracted and if the piece can achieve attraction that's what I want," said Rondinone.
The artist says the work is supposed to represent a blend of Las Vegas, with the artificial, neon colors, and nature: the limestone boulders are from a local quarry, weighing on average 40,000 pounds each.
It is presented jointly by the Nevada Museum of Art and the Art Production Fund. It will be taken down in two years.