Teaching Colour Theory

Techniques that I use to teach, come from varied sources. Some were established in my initial foundation years at Great Yarmouth College of Art. This one is a classic, I hated it at the time but now remember and reuse it with great fondness, as it really makes people really look at the composite colours of what ever subject they are painting. 
You have to make a grid, this time I was gentle with my students and they had a 2cm grid when I did this it was a 1cm grid. You then gently sketch the scene you are working from and then as a student pointed out you 'pixelate it', trying to match each grid square as closely as you can to the corresponding square on your subject and choosing the colour that is dominant in that area.
The results can be stunning and what is great is it teaches very valuable lessons in colour and observation.