Here’s how to do a Jacob’s Ladder:
The basic fabric needed is a combination of double crochet stitches and chain stitches. In this example, I’ve decided to do one ladder with 5dc on each side. To recreate it, ch22, dc in the fourth chain from the hook, and make 3 more dc stitches:
dc to the end of this row.
Continue adding rows, working a dc into each dc, and working a ch10 over where a ch10 is.
Then dc to the end of the row as normal
Put the hook under the next loop and pull that loop through while lifting the loop on the hook over the new loop.
Put the regular hook back into that big loop you pulled out before (it’s time to start crocheting again!). Take the big hook out of the loop and hold it in your left hand. Put the regular hook through the ladder loop, from front to back:
And you’re done!
And no, there’s no particular reason why the ch10 spaces have to be directly on top of one another, but don’t put them too far apart. Shifting by one stitch is absolutely do-able.
If you want to replace the dc stitches with something else, you’ll have to change the chain spaces – for shorter stitches, you’ll need shorter chains, I imagine. I’m not sure if anyone has tried it out, yet.
Edit: once you’ve mastered this technique, you might want to check out my Jacob’s Snakes And Ladders blanket pattern.