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It's not totally dry, but too stiff to work with. Use the end of a
broomstick, a wooden spoon, or even a large screwdriver to poke holes in the clay, almost all the way through (leave about an inch at the bottom.) Fill the holes with water. Come back in a day or two and wedge the clay up. It will have absorbed the water and be nice and moist! An alternative method is to cut the clay into slices, soak them in water, then wedge. Or, take a soaking wet towel and wrap the clay with it. Place the whole thing inside the plastic bag. A couple days later, voila! Remember it is important to wedge clay especially when it has been rehydrated, to even out the moist and dry spots. Otherwise you will have difficult throwing, and pieces might warp as they dry.