All Possible 4 Digit Combinations

Nivelador en 3D. 3D level 3D

all know that is the foundation of a level.
usually is referred to a tool that lets you know when an area is completely level with the ground, using gravity. It relies on a drop of air flowing in a fluid, when this gout, is in the exact middle of the tube is stuffed ... we are making the correct level.

So far the levels were defined shapes, I would call them in 2D, I have designed a 3D.

would be, applied to a 3-dimensional geometric shape (in this case a cube) , a "apothem" per side (pusher tube would drop air-fluid circulation) , so way we defined the 3 levels, I mean the 3 dimensions of a single stroke or movement ., I leave drawing:

I leave also the classical level:

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