When I read "S-curve" I knew immediately which pattern I would use, although it's one I've rarely used. It's called Mambo, and was designed by Helen Breil. I discovered it when I was hunting black-and-white patterns in between discovering Zentangle and becoming a CZT.
Here's my original note about Mambo, and how to draw it.
#1 - I used a simple, 3-line, lightning bolt string across the middle. I wanted only two variations per tile so I could see them easily. First I did Mambo as Helen did (left side), then filled alternate stripes black (right side).
#2 - Sharla suggested using Perfs and Auras as part of this investigation so I did Perfs on the left and Auras and Perfs on the right. I added Black Pearlz to a few too-white areas.
#3 - An easy way to vary a tangle is to vary the scale, so I did Mambo smaller, and larger.
#4 - I thought Mambo could be interesting as a border and tried that, small and large. The tangle in the center is my latest, Pixioze.
#5 - Then I thought, "The S's don't have to be empty" so I filled them with stripes (top).
In previous tiles some of the 'S's connected in ways that seemed like ribbons and I decided to explore that idea further (on the bottom).
#6 - Then I thought, "S's don't have to be curvy" so I did them with angles and corners (left). Then I realized that the angular S's could work in a rectangular grid (right). I experimented on the back of the tile first! Okay, not undulating, but still cool.
#7 - Filling in those two loops of the 'S' with stripes reminded me of Aquafleur, so I did one like that. If you look closely you'll see that the lightning bolt division is horizontal.
|Other tangles: Aquafleur, Aura, Black Pearlz, Firecracker, Tipple|
#8 - Then I thought, "It doesn't have to be a Roman letter S" so I did the only other one I know, an Arabic S. (My husband and several other people were having a meeting upstairs, so I was holed up in my basement studio for three hours. What can I say. I was becoming somewhat Mambo Undulation Variation Punch Drunk by this point!)
|Other tangles: Beadlines, Crescent Moon, Pearlz, Tipple|
|Other tangles: Aquafleur, Knightsbridge, Tipple|
The next day... yes, seriously. I was still thinking Mambo and S's and undulations.
#10 - Pencil outlines. I decided to use the S's as a string, although in the end many of them got outlined anyway.
|Other tangles: Aquafleur, Beadlines, Black Pearlz, |
Lamar, Paradox, Pearlz, Phicops
I think that's all folks. I hope so. I have other things to do. Thanks Sharla! I'm not sure if this is what you had in mind, but I had fun. :)