Try to look carefully for a moment! .... ok .. about things like this image in a state of what's not real, think for yourself ....
Hehehe ... weird right ..!
How to make this very simple, there are two images of the same object, try if we slide down one of the object ....
We continue to waste one of them, then just like this picture;
If we dispose of gradation as below picture, easy right .. we just create one object and then we copy and in the Mirror, and then we combine .... finished ...
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