Part of what fascinates you about Spinoza is the fact that he was said to have kept extensive sketchbooks of drawings that were lost. Are there other authors you think of as both writers and artists?
The topic of sketchbooks is a very complex one but in summary, there is no perfect sketchbook that suits everyone in every situation. The media you use will have a big impact on the type of paper that will suit but you also should consider size, format and binding.
I predominately work in sketchbooks as I want to record my life and love the narrative of my creative journey that is created in the pages of a book. You can see from above that I have quite a collection. Read more about that here.
df19127ead