This example is from Wikipedia and may be reused below a CC BY-SA license. They can be sculpted into different shapes in the course of this process, at times resulting in deep thumb-print like indentations on their own surfaces identified as regmaglypts. From Wikipedia The ASL fingerspelling provided here is https://arthurqwojc.blogrenanda.com/42901735/sculpted-md-lakewood-no-further-a-mystery