The grade
Apex fails first. Pictures lag.
Terraces crumble from the high step, not the middle. Hang dies. From a drawer the face still looks curved. Yuba roll fails like that.
Ash on a known stone shows where the face starves the powder. Pale means collapsed apex. Sundial afternoons hurry it: river wind files the high step while a Turtle Bay walk still sits in a hatch.
Pale crown plus ashy low groove means two terraces. Living low step does not buy a dead apex a recut. Corin retires the apex and leaves the low step.
One roll for the whole head averages a cliff with a landing. This bench will not.