Semi-circular shawls are a beautiful trap. They start off with 8 or so stitches per row. Not bad at all. Very quick rows lead to a certain sense of accomplishment. Then the number of stitches per row increase, of course, to create the half-circle shape. But you think to yourself, "ahh, this is fine, I am a patient person, I am enjoying the knitting process!" And then the rows start taking five minutes to complete. Perhaps even ten. Then twelve... I am currently up to a 25 minute row. I am not going to count the number of stitches per row right now, as it would just make me sad. And the stitch count will double at least once more before I'm done! On the bright side, I'm using quite a lot of yarn!