Eliezer: "A little arrow"? Actual little arrows are pieces of wood shot with a bow. Ok, amplitudes are a property of a configuration you can map in a two-dimensional space (with no preferred basis), but *what* property? I'll accept "Your poor little brain can't grok it, you puny human." and "Dunno - maybe I can tell you later, like we didn't know what temperature was before Carnot.", but a real answer would be better.