1) The inside of a Fuction[br][br]2) The " Red " Vector a x = -1 : Red Line = 1.41 and It's a Constant reference to the space between functions: Datum Point[br][br]3) For me this is Good Stuff[br][br]4) One Function " H " is keeping track of functions " P " and " Q " via the Red Line[br][br]5) So what that tells me is this : At x = 0 R.L. = 2 ; At x = ? R.L. = 1.41 : Therefor the Function rotates 45 Degrees from 0 to - 1 : that's why Graphics is important.