This instance is from Wikipedia and may be reused under a CC BY-SA license. They can be sculpted into several shapes during this method, at times causing deep thumb-print like indentations on their surfaces called regmaglypts. From Wikipedia This example is from Wikipedia and could be reused beneath a CC https://sculpted-md-lakewood06161.yomoblog.com/43162901/the-basic-principles-of-sculpted-md-lakewood