This example is from Wikipedia and may be reused below a CC BY-SA license. They can be sculpted into various designs through this process, sometimes leading to deep thumb-print like indentations on their own surfaces named regmaglypts. From Wikipedia References in periodicals archive ? Sculpted via the internationally-acclaimed JOOheng Tan https://sculptedmdlakewood71368.activablog.com/35566771/not-known-factual-statements-about-sculpted-md-lakewood