The same Feigenbaum's scaling symmetry with period doubling presents near every "mu-atom" (black circle).
You can also see amazing similarity between the Mandelbrot set filamentation ("antenna") near the cross position and the Julia set ("aeroplane").
Click mouse into the Julia-set to stop animation or Demo.
Click mouse into the M-set to stop "animation" and go to the mouse position.
Click mouse + <Alt> to Zoom In (the applet stops animation before Zooming!).
Click mouse + <Ctrl> to Zoom Out.
<Shift> to modify Zoom In/Out 2 (Feigenbaum's zoom).
<Enter> to set new parameters from text fields.
Steps - number of steps in animation
It - max iterations number
Delay - delay between two frames
no label - the cross position
Period - an orbit period at the cross position