This instance is from Wikipedia and may be reused under a CC BY-SA license. They are often sculpted into different styles through this method, from time to time causing deep thumb-print like indentations on their own surfaces named regmaglypts. From Wikipedia This example is from Wikipedia and may be reused https://sculpted-md-lakewood97417.techionblog.com/36493317/the-definitive-guide-to-sculpted-md-lakewood