Live demo
Go on, touch it.
This is the real iPad interface, the same code that runs in Safari on the iPad, connected to a simulated Mac that runs right here in your browser. The numbers move, the buttons answer, and nothing happens to your computer.
What's simulated: the Mac's numbers, apps, music, calendar and speakers are made up. In real life, the iPad talks to the OldPadDeck app on your Mac, and you pair it once with a code shown on the Mac.