PostScript is currently underappreciated, and I highly recommend learning it. Among many other uses, I like to use PostScript as a portable animation language to visualize search processes like in this case.
Also, programming PostScript is great fun and in a sense quite timeless: In all likelihood, these definitions will work without change also in the distant future, because PostScript is so widely spread and frequently used.
Newer graphics languages and concepts also take many ideas from PostScript, but PostScript is in my experience still the most fun and flexible of them, at least for a very large set of important use cases.
