margin
Does not change the shape, only the axis aligned bounding box defined by corner and size.
For example, if we add a margin around a shape, and then tile it, the gaps between the shapes will be margin*2.
You can also apply a negative margin, in which case, tiling may cause the shapes to overlap.
Example usage : If you have a cube, with small knobbly bits, but when aligning the shape, you don't care about the knobbly bits, you can use negative margins