“And the eye in the sky is watching us all,” he says, a line that holds true in the real Las Vegas outside of the movies. At the top of this food chain: the all-seeing surveillance cameras. It’s one of the more famous scenes from Martin Scorsese’s movie “Casino,” when Robert DeNiro’s character Sam Rothstein lists the myriad layers of security that go into protecting the fictional Tangiers from cheaters. The Rampart casino (Las Vegas Review-Journal file)