This instance is from Wikipedia and will be reused below a CC BY-SA license. They are often sculpted into several shapes throughout this process, occasionally leading to deep thumb-print like indentations on their surfaces called regmaglypts. From Wikipedia References in periodicals archive ? Sculpted with the internationally-acclaimed JOOheng Tan and https://sculpted-md-lakewood14792.uzblog.net/detailed-notes-on-sculpted-md-lakewood-50042468