Hi Brian, well it was just a demo of one kind of shape that can be done with even increments along an existing edge.

If the things that you are making are aligned to the grid, then you don't have to worry about any of this at all and just use the grid snap instead. That's the more typical situation.

Some people may want to construct a model that has some piece in it that does not happen to be aligned or sized with the grid but still has a type of regular increment nature to it. That's when this kind of procedure can be useful, it kind of lets you lay out a quick temporary custom spaced grid right in the location that you are drawing in.

- Michael