To use proximity to increase the harmony and unity of a piece, you need to keep the elements clustered together. If the elements are just scattered over the surface, the piece will look very random and chaotic.
Instead, keep all the elements close together. The piece above made with all French knots is an extreme example of clustering the elements together. This piece has the stitches crammed together with only a few scattered down from the right corner.
How do you use proximity of the elements in your work? Leave a comment, I love to hear what you are doing.