"They function like a security blanket for me"
(Michael Bierut, Tumblr, Random)
They are the stepping stones to making and creating work. They hold all the scrapes we think we think will come in useful. Sketchbooks are like 'security blankets' because they are full of the original ideas the artist comes up with.
Whether digital or physical you know you will always have a place for your collect objects and that it won't get lost or deleted. Like "security blanket" they keep your work safe.
"Sketchbooks allow creatives to engage with the domain as a form of preparation"
(Shaleph O'neill, Designing a digital sketchbook, 5.1 Engaging with the domain)
Without a hand written book it can be hard to start creating. Sketchbooks are the foundations and research to a project. 'Preparation' gives the artist chance to work and make something great. Everything needs to be planned and a sketchbook to an artist is a plan.
"Majid Abbasi, Tehran-based creative director of Did Graphics, admits that many of his sketches are digital, not drawn" - (Graphic., Thams & hudson, 8)
Whereas my other quotes spoke about the appeal of sketchbooks because of the usefulness within the pages being like a 'security blanket' and getting 'engaged'.
This quote represents why the digital is better. It can still be easy to collect images together with the right devices and even easier to make your own with the right programmes.

