Experimental Drawing by Robert Kaupelis

I have now been given the task to write about three different artists who use experimental drawing as inspiration, or for any other way.
Experimental drawing is when you draw or do an initial sketch to gather up your first ideas.

Here is the cover for a book by Robert Kaupelis.
this book was about experimental drawing.
I gather that Kaupelis is known for his drawing as he has written this book about it.
Experimental drawing is when you just draw basically to get ideas and inspiration.
it is often used with illustration and life art. it mostly looks like modern art, so, a little brash and crude here and there, but, not void of intelligence and ideas from the artist.