All you want to know about painting: questions

Here is a list of questions for my "All you want to know about painting" series (experimental fall run from mid-September till mid-December, approximately one answer a week; some of these questions might need more than one blog post, though...). There are still a couple of spots left for the fall run, so if you have questions for me, don't hesitate to ask!) And if you asked a question and I've missed it here, please tell me -- it could only have happened by accident.

1. When and how did it get decided that black and white were not colours? (This comes from Rilke's observation that Cezanne used white and black as colours and that this seemed to be something new.) -- +Terrill Welch 
2. How do you choose your canvases? +Tarja Ollas 
3. How do you incorporate a "story" (meaning some sort of "plot") into one painting? -- +Alexander M Zoltai 
4. How has compositional design changed through time? What is the use of triangles, picture planes, colour fields and such in compositional design? --  +Terrill Welch 
5. When is the best time to paint? -- +Rita OceanBlue
6. What is the visual continuum between what we see with our eyes, what we expect to see in a photograph and in a painting? Also, how do these various aspects influence one another? -- +Terrill Welch
7. Show your process, from start to finish for one painting (in the form of photo album) -- +Tarja Ollas
8. What has an artist limit their colour palette in such a way that all their work looks like it is painted on the same day at the same time of day? Or with no light reference at all? This might be asked more accurately as what is the influence of artificial lighting and colour theory in painting? Or maybe it has to do with this idea of creating a solid body of work in one style? I have no idea. I am just puzzled when I notice this result in an artist's work - my own included at times. I wonder - what is really happening here? -- +Terrill Welch 
9. How do we develop a painting language and what is it? -- +Terrill Welch 
10. How do you know when your painting is finished? -- +Tarja Ollas