Blocks & Decoration Foreground Walls

I've seen a modification that adds this (where it copies the background from one place and moves it to the foreground in another place). The effect is impressive not only in buildings but also in biomes. I recommend seeing it with your own eyes.
What is the mod's name?
 
At first I didn’t really like this idea. But now after giving it some time I can think of some artistic and depth uses for this especially in the actual foreground among other things. So thumbsup.
 
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