You all should sit down and take a leisurely read thru this fine book, available online as a PDF: Thinking in PostScript . Stack languages like PostScript are a neglected challenge. This book is an educational afternoon's read.
When I am appointed the plenipotent Kommissar of Earth (a situation so clearly in the public good that it cannot conceivably be delayed any further), I will mandate that all CS students take a semester of PostScript. Instead of Lisp. Yes, I rebuke the Lisp, as its charm as a language has long since been obscured and mashed by its massive self-importance.