The secret to a reversable cabled scarf is ... ribbing! Promise! That's all there is to it.
Knit the Onduleux "Wavy" Cables Scarf with 2 Be Sweet Ribbon Balls or 2 Be Sweet Magic Balls and 20 yards of Hannah Silk ribbon or similar. Suggested needles are US 11 (8mm) Needles and US 19 (15/16mm) Needles. You will also need a Cable Needle and a Yarn Needle.