What is this air play mirroring icon that started showing up in the upper right?

Started Jun 20, 2013 | Questions thread
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What is this air play mirroring icon that started showing up in the upper right?
Jun 20, 2013

I have a macbook pro retina 13" just a few months old and recently this air play icon (or maybe it is a display icon) started showing up in upper right hand corner by the bluetooth, battery, date, time, and other icons.

When I click on it today, it is saying apple tv. I believe yesterday when I was at the airport (not the mac airport) it was showing something like someone's computer. Something. I don't remember exactly.

Can anyone explain what this is?

Question #2:

Why did my desktop picture change. I know computers are weird and they just do things sometimes, but can anyone explain why the picture on the desktop changed from one of my pictures, back to the default cosmos or milky way, whatever it is?

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