This example is from Wikipedia and should be reused beneath a CC BY-SA license. They are often sculpted into a variety of shapes in the course of this method, from time to time leading to deep thumb-print like indentations on their own surfaces named regmaglypts. From Wikipedia References in periodicals https://sculptedmdlakewood90900.total-blog.com/how-much-you-need-to-expect-you-ll-pay-for-a-good-sculpted-md-lakewood-61677466