I took a book and cut the inside out of it and can hide things inside of it. There is an arduino on the inside and a light is on when you open the book
Step 1: Cutting
I hollowed out the book and made the compartment.
Step 2: Light
I connected an LED light to an arduino and it runs on a battery. The light will be on when you open the book.
Step 3: Hidden Arduino
The arduino sits on the inside and you can hide things beside it.
Step 4: Hiding Objects
I hid a phone in the book.
Step 5: Cover Page
I left one page unglued so you cant see the objects when you open the book.