There's also this other dimension to it that is often overlooked, and it's behind my saying "I wouldn't teach this". The analysis and reduction based method relies on your ability to digest what you see mentally and that has limitations. For example, if you asked a child to draw a rough sea, hair on somebody's head, the clouds, the forest or whatever, he would become frustrated with the sheer complexity and probably degrade to what we call "child's drawing", which is a misnomer, since most adults draw this way. Child's drawing is when you draw symbolistically: this is a head, these are lips, this is a tree, this is a bush, etc. On the other hand, if you "draw what you see" which is another horrible term, coined by me this time, you're not bothered by complexity, you celebrate and marvel at it, in a frictionless way. Again, I'm recommending that book I linked, great stuff.