From the Canon USA YouTube Channel:
Understand, and learn how to customize and operate, the EOS 6D's in-camera Multiple Exposure Shooting feature. For more information, click here.
Note: Multiple exposures can be a lot of fun. I was testing out the feature on my 5D Mark III during the fall season when I created this:
If you have a camera with the multiple exposure feature and you've never used it, there's no better time than now to start exploring the creative possibilities!
B&H carries the Canon EOS 6D.