Easter Egg?

This might be an Easter egg, or it might be documented.  I admit to not reading the manual.  The Xbox360 Live Vision Camera works with many games and applications, but not all.  I was playing music with the visualizer on full screen--not recommended to those who get motion-sick easily!  The volume was way too loud, so I pointed the remote at the TV and turned it down.  The interesting thing was, when I used the remote, a white dot appeared where I was pointing on the TV!

I thought the TV screen was sensitive to infrared, but it never did that before.  It reminded me so much of the Wii-mote that I started experimenting.  No, the dot doesn't appear where I point it, but it does move.  Finally, I figured it out.  The Live Vision camera provides input to the visualizer, highlighting in white which pixels have drastically changed.

Then the parapara started.  Then I shifted left and right.  The truth is, dancing in front of your camera during visualizer is kind of fun!  Check it out sometime.