Blogless Susan posted a wonderful explanation of superimposed knitting, but she pinned it as a comment to another, much later, post. So, for those of you who missed these entries the first time around, I am combining my original blog posts with her how-to description.
By an amazing coincidence, the book I reviewed in another post,
Creating Original Hand-Knitted Lace, also contains written instructions for using this technique on a set of baby clothes with pretty lace edgings.
From Blogless Susan
In short, the technique is similar to, but different from, double knitting. For the shell motif I cast on 15
sts using a strand of both yarns. Purl 5 using both strands, then the fiddly bit.
Separate the yarns for the next 5 stitches. Put the colour to be patterned on a
dpn at the front, and the pattern background
sts onto the left needle. Then, using the pattern colour and right needle, pattern across the 5 stitches.
Drop the pattern yarn, pick up the background yarn and using a
dpn work the 5 background stitches, pick up the other yarn and work the remaining reverse
ststs with both yarns.
So, you need 3 needles, or two longs
circs (but I hate
circs). It becomes obvious pretty quickly when to change yarns and needles.
When you need to incorporate one of the edge
sts into the pattern you just separate the strands (
ie row 3), or knit two together with two strands when you need to decrease the pattern number (
ie row 9).
Working more than one motif across the row is a bigger pain. You really need to use 2
circs, as there is very little flexibility when using straights. I put all the pattern background onto one needle at the back, and the patterns and reverse
stst on the front needle. Lots of fiddle working across the row - needles and yarn all over the place. But the finished product looked good.
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Original PostsI found this pattern (and several others like it) in a Japanese pattern book. Look closely at the picture. You'll see that there are two layers of knitting here. What? How did they do that? Any ideas?

Here is another example of superimposed knitting that I talked about yesterday.

Both of these are from the book
1000 Knitting Patterns. The book is in Japanese, and available
here. Like all Japanese knitting pattern books, it is lavish and full of unusual, elegant patterns. There's an entire section on multicolored cables, something I've seen only one other knitting book ( a really old pattern book that I am too lazy to go look for right now).
1000 Knitting Patterns weighs a ton, and costs the earth ($60). I hauled it back to my apartment in Japan on the train,
in August, so I know how much it weighs.
As with all Japanese knitting books, everything is charted, so rarely will anyone have trouble following the patterns provided he or she has invested in a Japanese knitting symbol dictionary. For those still searching for one, go
here.