This instance is from Wikipedia and should be reused below a CC BY-SA license. They are often sculpted into numerous designs during this process, sometimes causing deep thumb-print like indentations on their surfaces identified as regmaglypts. From Wikipedia This example is from Wikipedia and could be reused under a CC https://sculptedmdlakewood04702.newbigblog.com/42718120/the-basic-principles-of-sculpted-md-lakewood