People may pursue extreme body modifications for a variety of reasons, some of which are still only beginning to be fully understood and explored. These alterations, which can range from anything including tattoos, piercings, and modification of tissue and bone, have a long history that reaches well into prehistory. In modern times, a wide variety of motivations and religious and spiritual practices continue to provide a framework for many individuals who see body modification as an essential part of their journey of self-discovery and identity formation.