Default YouTube Video Page 
Having the darker interface allows the content to come to the forefront. 
The Next video is also more prominent slightly opaque to the right of the primary video.
Tthe thumb up and down console has been enhanced to promoting the voting interaction.

Cinema View Interface
Removes the clutter and distractions into the background.
Enlarges the primary video to take better advantage of the screen without the overwhelming fullscreen mode.
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