The idea behind this is to control the visibility of objects and bricks. The way it would work is that by these bricks the build or the area could be divided into visibility blocks where each adjoining or directly visible would be rendered, but not the ones that are further away from the block you are looking at (distance would be controlled by the draw distance setting), or the ones that you are not looking at at all.
The main benefit of this is that you could have more control over the visibility of bricks and objects, while also reducing the stress.
The question is: is this possible at all?