ArtMetal

Fred,
I shall have to make another pilgrimage to the 'tute.

The concentric hammer blow pattern on the bottom shows how the base was tuned and leveled by planishing. That action also would have deepened the bowl.

The bowl was not particularly deep.
the 6.5" dia fold formed bowl I made was 2.1" deep.
At 14.625" Karl's bowl is over twice that diameter and only 2.875" deep so most of the shape was from the folding.

My bowl had a single sided flute in each radial pattern, The Nikrasoff bowl has double sided flutes which eat up lots of material. That was partially offset by the stretching the texture blows added to that portion of the radial flutes.
I think we may have more of a folded flamenco dress (added gores) here than a raised piece. The radial "cross peen" tool marks show that stretching has occurred around the circumference,

Gene Olson
Sculptor
Elk River, MN