Amid the visual cacophony, one tower stands high above the others—elegant, aloof, Oz-like. It is Burj Khalifa, and at 2,717 feet it is more than twice the height of the Empire State Building. Which, much to the glee of the powers that be in Dubai, makes it the tallest building in the world. One of the first tenants is the Armani Hotel Dubai, occupying the underground level through floor 8 and floors 38 and 39, and representing designer Giorgio Armani’s debut as a hotelier.