I do enjoy this swirl on the inside of a shallow bowl made by an Athens (GA) potter-friend. It is a finger-ridge on the clay that has heightened the shading in the glaze. I like the crazing/crackle/craquelure*, too. Crazing is not crazy.
* The appropriate term depends on whether the effect is intentional or not, as I understand it. In this case, I dunno the intention.