Experimental Drawing by Peter Grey

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.

This is the cover to a book by Peter Grey.
Grey outlines and teaches you how to draw and illustrate in this book.
when upon reaching the life drawing pages he shows us some experimental drawing done by him.
Here is what the pictures look like in general.

Here we can see Grey has experimented with a number of different angels and poses. this is what experimental drawing is about. to gather your ideas together for one final project.