This would be much more useful in 3d where you could project lines out from each of the points of intersection, representing the resulting number. If you look at the second example, which has 5 digits, the points belonging to each digit are arranged in vertical lines.
There's still carrying 10s to worry about, but you could just do that periodically when the diagram gets unmanageable.
There's still carrying 10s to worry about, but you could just do that periodically when the diagram gets unmanageable.