This example is from Wikipedia and will be reused beneath a CC BY-SA license. They are often sculpted into a variety of designs for the duration of this process, at times resulting in deep thumb-print like indentations on their surfaces termed regmaglypts. From Wikipedia This example is from Wikipedia and https://sculpted-md-lakewood59146.thezenweb.com/sculpted-md-lakewood-can-be-fun-for-anyone-74555150