After some reading on the internetz, I decided that I wanted to try to make/grow a levain. I started on Monday, and the recipe I found was something like 2 cups of flour and 1 cup of water, mix it, and let it sit for 24 hours. I should add that I was using only all-purpose flour, as per the recipe.
There wasn't too much activity, maybe a few bubbles. I took out half as per the instructions, and added one cup of flour and a half cup of water. I moved it from the counter to the top of the fridge, thinking maybe a little bit of warmth wouldn't hurt.
That night, the starter was to the top of the container (a 4 cup pyrex). I was pretty excited! I took out half, and added a half cup of water and a cup of flour. The next morning I put a cover on it, although it was only partially on. I was a little concerned that the top of the starter was a little crusty from drying out.
I've taken out half, added stuff to it twice now (after 12 hour intervals), and although there are some surface bubbles, it hasn't really risen at all.
Should I be concerned? I realize this will take time, but I was just wondering what any of you might think.