This instance is from Wikipedia and could be reused under a CC BY-SA license. They may be sculpted into many designs through this process, occasionally leading to deep thumb-print like indentations on their own surfaces identified as regmaglypts. From Wikipedia This example is from Wikipedia and should be reused below https://sculptedmdlakewood00630.theblogfairy.com/35488471/the-basic-principles-of-sculpted-md-lakewood