Difference between 'made of' and 'made from'

Have you ever wondered what the difference is between 'made of' and 'made from'?

Cambridge Grammar of English by Ronald Carter and Michael McCarthy provides this helpful and succinct distinction:

‘Made from’ is often used to describe manufacturing processes . . . 

‘Made of’ emphasises the inherent material or qualities of something, and has a meaning similar to ‘composed of’.

Thanks to Jacqui Birnie for the 'research' on this issue.