Ghostscript is a suite of software based on an interpreter for Adobe Systems' PostScript and Portable Document Format (PDF) page description languages. Its main purposes are the rasterization or rendering of such page description language files, for the display or printing of document pages, and the conversion between PostScript and PDF files.
Steles are the tools used by Shadowhunters to draw runes onto their skin, weapons, and other materials. They are made of adamas and crafted by the Iron Sisters.
On steles! Hammurabi's Stele is a seven-foot-tall slab of stone on which the law code is written. This stele was placed in a public, visible place, where people could read the law, which was written in the most common language of the region, Akkadian. So, this is functional art, or art with a purpose.