When I saw the original design by Paul Wearing, I just thought it would be fun to try and replicate in part. I wondered if the Blend tool in Adobe Illustrator was the thing to use - and it certainly was.
The other handy Illustrator device was using clipping masks to contain the blended lines. The artist made amazing use of very minimal forms to express area and different feelings of weight. The eye motif was formed using the Curved Line tool and then reflected in the horizontal, the Join Lines tool knit the anchor points together, that all that reflected again in the vertical. The inner path was made in the same manner, then both paths combined into a Compound Shape.