From paper to digital.

I have been recording my journal for the past few weeks on little scraps of paper, back of receipts, and corners of brochures. So I have decided to transfer my entries from paper to digital.

Week 1:
In the first week we were asked 'What is a book?'.
My instant response was; a book is a compilation of text and/or image on paper bound together.
Books can also be made out of other materials like bamboo, leather, or even a piece of wood.

During the first week, these questions were posed to the class. Is a blank spiral bound notepad classified as a book? Is a scroll a book? Is a folded accordion a book? Is a glued notepad a book? Would we call a spoken CD a book?
This makes me think further on where the boundary lies for the word 'book'.

If anything the basic elements should be the form and the function. For example physical appearances and it should also communicate information to the audience through various forms.
In this digital age, I guess a CD could properly be accepted as a form of book depends on its content.