Spiral-stitch hat

Here's a nice simple hat pattern that popped into my head as I was re-knitting the knotwork hat.

Cast on enough stitches (a multiple of 4) on a circular needle to go loosely around the head. Join in the round and mark your starting point.

1. Knit one round of k2, p2 rib.
2. Cable two left (place two stitches on a cable needle, purl one stitch, knit two stitches off of the cable needle), purl one, repeat.
   At the end of the round, move your starting point forward one stitch.

When the hat fits from ears to the top of the head, begin decreasing on the purl stitches. As before, after every cable row, move your round marker forward one stitch.

Essentially,ssk the last knit stitch of every fourth rib together with the following purl stitch. Cable the next round, then ssk on the cable before the decreased one, cable again.

The chart shows four cables; the parts in purple are repeats of the pattern. Rounds 1 and 2 should be repeated until the hat is tall enough, as described above.

These decreases should spiral around to the middle, where they meet.

After you're done decreasing, pass the yarn through the remaining stitches and pull tight.