This is a plate I got a little intense about when I was throwing it on the wheel.
I pushed the rim too far and it did this.
I cut it off from the wheel, laid it aside and went on with whatever it was I was doing.
Later, I looked at it and decided, "What the heck, let it dry."
I bisque fired it, tried a white glaze on it as a test firing and Voila. Not a bad plate.
So, don't be too hasty or too harsh about how your work turns out.
Besides, I don't think I could do this again if I tried.