So at the click of a button you can set your room to 3 very different light settings that fit with what you want to do at the time.
Snug - Base of the app, showing the media centre controls Here you can turn the media centre (Apple TV in this instance) on or off. By turning it on, the Apple TV comes on, the projector turns on and the lights change to 'Movie'. When you turn it off, the projector turns off, Apple TV turns off and the lights turn off.
The aim here is to give you granular and large scale control in one simple screen. You can either use presets or play with your lights directly.