Bisque those pots

The crumbly dry clay is solidified enought that it will no longer fall apart, once it's bisque fired.

The stoneware clay has changed from a pale greyish pink into the light orange/pink color.  Things that are made of white clay become bright white.  Since there is no glaze that would stick these pieces to each other, they can be stacked.

That is the stage that allows the potter to put glazes on it, and/or decorate a pot in many different ways.