Revealing Slant in Mathematica

Jilyan Landon of Mathematica points me to a post in the Wolfram Blog. There something as mundane as an error message gives a hint to how well integrated Mathematica is. Reminds me of such arcane and now little-used languages like Lisp. Good example of why it could be used for applications like Wolfram-Alpha. The point may be lost on those without some computer science background, but it is a good one.