Multiple distinct (and usually opposite) themes being represented at the same time, with a split between them as a way to represent contrast. 

The simplest way to do this is to have two opposite themes on each side with a clean split in the middle.

Examples:

* Two different characters being portrayed as one (post #1318355)
* While a character is in the middle of a [[henshin]] transformation (post #1841349)
* Revealing the "true nature" of a character (post #6870337)
* Comparing how a character looked when they were younger to when they're older

h4. See Also
* [[juxtaposition]]
* [[polar opposites]]
* [[sword in front of face]]