Hiding Place in Book With Arduino

The supplies you need for the book compartment are as shown:
-a brush
-a thick book
-glue
-cup
-box cutter

You first want to glue all the outside pages together then when that dry you want to start cutting out the center. Then when your done with that your book should look like this.

You will then want to glue the next inside pages together.

The Adriano will be hidden inside the book and these are the materials you will need.
Arduino board
(1) LED
(1) analog sensor (a photocell will do)
(1) 10K ohm resistor
(1) 220 ohm resistor
breadboard
hook-up wire
This is the link to the code that you will need a computer to download it.
http://www.arduino.cc/en/Tutorial/Calibration

Once you get everything downloaded and working you put the arduino in the center of the book with a battery so it works. Like so.
Now you have created a hidden book compartment with a photocell arduino with a led light.