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You're missing something: The way to project an iPhone onto your Mac screen with OSX is to use Quicktime movie recording mode and select your iPhone.

Ah, that makes sense. Thanks!

Isn't that just a workaround to get a live view of the device on the mac to show on the projector?

I think there is an option for screen recording from a real device in QuickTime. It is mostly used by developers to create promotional videos for an App Store page.

I think "Movie Recording" literally means that the movie is currently recording, i.e. he's using the QuickTime movie record feature as a trick to get the iPhone screen to show on his Mac, and thus the projector.