t = 0 Pt = 2.000
Vertical move evaluates F; horizontal move copies the answer back to
the axis. Watch the equilibrium at 0 (Malthusian) or at P=K
(logistic), and whether nearby points move toward it or away.
For chaos (try r=2.75), turn on the second orbit and watch the
two colors track together, then split apart --- the time-series
panel below shows this more clearly than the cobweb itself.