Since the head is clear, now also a brilliant brain can enter it. This I imagined as follows.
The brain is composed of 1 to 3 meter Led-stripe, it have 60 Led´s per meter . The length is decided depending on the look . A brain -ike structure is applied and thus the length is decided .
We want to get an idea of the exact look of the brain when we build a brain example from 1cm thick tube .

( Pictures will follow )

The brain should be with a arduino controlled .
Depending on the mood of the Okopuses the color of the LED strip to be changed. So if the octopus is in a good mood is light up the brain green, less yellow and if he has quite a bad mood , it will glow red .

My first stop was the dimming of LED’s this I’ve found on the following page :
http://arduino.cc/en/Tutorial/Fade
( Pictures will follow )
Next, I studied the wiring diagram for the LED ribbon this can be found on the following page:

 http://www.jerome-bernard.com/blog/2013/01/12/rgb-led-strip-controlled-by-an-arduino/

( Pictures will follow )