[y_=_x_+_1] [y_=_x_*_x] [Phi_=_1.618...] [Phi_=_-0.618?]
Where did this come from?
Despite the oddity of this '~phi', if you consider the rectangle formed by the blue lines, the x axis, and the y axis, you'll see it's a Golden Rectangle with sides of ~phi (horizontally) and both ~phi * ~phi and ~phi + 1 (vertically).