I think it's kind of a chicken-and-egg question, personally. Compared to array languages, most other programming languages are, in a sense, tree-oriented. Does

I think it's kind of a chicken-and-egg question, personally. Compared to array languages, most other programming languages are, in a sense, tree-oriented. Does their prevalence mean that our problems are mostly tree-structured? Or is our propensity to see problems as tree-structured a result of brainwashing by our tools? "A prisoner falls in love with his chains" as Dijkstra said.