I do get a little annoyed with Bob because of his whole "there are no mistakes" approach to art. I get told all the time when I teach that there are no mistakes in art. This is not just Bob's fault. It is a misconception that has indoctrinated art educators for many years, and they, in turn, indoctrinate their students. It is an idea that I think started with good intentions, probably to encourage students to give art a try, and not to get hung up on getting it "right". Plus, there is whole idea of the fragile self esteem, but I don't think I want to get into that at this time.
But this doesn't take away the fact that mistakes, getting things wrong, and accidents - sometimes happy, but usually not - are necessary for the creative process. Mistakes are how art students learn. Mistakes are how artists learn. That's why many artists create a lot of sketches to plan and prepare the design for their artwork. Sketches are a way of working out the kinks before actually working on the art. Sometimes no matter how much preparation and sketching is done, mistakes still happen. So I tell my students that there are always mistakes in art. Not every piece is a masterpiece, but every piece is an opportunity to learn and do better the next time.
The purpose of art education is not to bring up the next Picasso or Leonardo. The purpose is to have students to give it a try. Do something different. Learn something new. Stretch the mind to different possibilities. Thus, one quote from Bob that I can agree with is this:
“The secret to doing anything is believing that you can do it. Anything that you believe you can do strong enough, you can do. Anything. As long as you believe.”
I think this is sage educational advice, with and without mistakes.